Photos: Before Trump's rally on Thursday, supporters waited in line for hours - some overnight

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Nick Hamer of Omaha and Tony Tedesco of Des Moines adjust a Trump shirt on Tedesco's dog Blake before President Donald Trump's rally at the Knapp Center Thursday, Jan. 30, 2020.

The crowd stops as the Star-Spangled Banner is played outside the Knapp Center before U.S. President Donald Trump's rally Thursday, Jan. 30, 2020, at Drake University in Des Moines.

A supporter sports Trump shoes and socks as he waits in line before U.S. President Donald Trump holds a rally at the Knapp Center Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Vendors sell hats and shirts to the hundreds of supporters waiting outside of the Knapp Center on Drake University before Pres. Donald Trump's rally on Thursday, Jan. 30, 2020, in Des Moines.

Hundreds of supporters of U.S. President Donald Trump enter the Knapp Center before his rally Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Hundreds of supporters of U.S. President Donald Trump enter the Knapp Center before his rally Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Hundreds of supporters of U.S. President Donald Trump enter the Knapp Center before his rally Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Josh Scheel, 16, of Waterloo, holds a sign while waiting in line outside of the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines. Scheel said that he feels that Martin Luther King, Jr., were he alive today, would endorse Donald Trump's reelection campaign.

Republican presidential candidate hopeful Joe Walsh speaks to members of the media while visiting with Iowans outside of the Knapp Center, the location of President Donald Trump's Iowa speech, on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Marthamae Kottschade of Rochester, Minn., holds a sign in support of President Donald Trump while waiting to enter the Knapp Center at Drake University to see the President on Thursday, Jan. 30, 2020, in Des Moines.

Lawana Frohwein of Gilman, Iowa, looks over a selection of campaign buttons at a merchandise stand outside the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines. Frohwein was on of thousands who showed up to wait outside for a visit from President Donald Trump.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

A supporter of Donald Trump holds a red Make America Great Again hat up while waiting in line at the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Erica Smith of Chicago waves U.S. flags while waiting to see President Donald Trump on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Thousands gather in lines to wait to enter the Knapp Center to hear from President Donald Trump on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Republican presidential candidate hopeful Joe Walsh speaks to members of the media while visiting with Iowans outside of the Knapp Center, the location of President Donald Trump's Iowa speech, on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Lawana Frohwein of Gilman, Iowa, points to a button at a merchandise stand outside the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines. Frohwein was on of thousands who showed up to wait outside for a visit from President Donald Trump.

Trump supporters gather outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

A group of Trump supporters pose for a group photo outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

A group of Trump supporters pose for a group photo outside the Knapp Center where Donald Trump held a rally on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Hundreds of supporters of U.S. President Donald Trump stand in line outside the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Hundreds of supporters of U.S. President Donald Trump stand in line outside the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Hundreds of supporters of U.S. President Donald Trump stand in line outside the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

A supporter of President Donald Trump spends time on a smart phone while waiting in line to get into the Knapp Center on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

A merchandise vendor stands on a snowy sidewalk outside the Knapp Center where U.S. President Donald Trump will speak on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Jaimi Fay of Omaha, Neb., carries a flag in support of President Donald Trump outside of the Knapp Center on Thursday, Jan. 30, 2020, in Des Moines, as supporters stand in line.

Walter Roach of Cedar Lake, Indiana, proudly wears a flag showing support for U.S. President Donald Trump on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Merchandise for sale outside the Knapp Center in Des Moines where President Donald Trump will speak on Thursday, Jan. 30, 2020.

Supporters of President Donald Trump make their way to the Knapp Center to join hundreds of other supporters prior to the President's visit on Thursday, Jan. 30, 2020, at Drake University in Des Moines.

Volunteers gather for final instructions as supporters begin to file onto the grounds at the Knapp Center in Des Moines to hear from President Donald Trump on Thursday, Jan. 30, 2020.

Supporters of U.S. President Donald Trump stand in line outside the Knapp Center in Des Moines to see the President on Thursday, Jan. 30, 2020.

Volunteers gather for final instructions as supporters begin to file onto the grounds at the Knapp Center in Des Moines to hear from President Donald Trump on Thursday, Jan. 30, 2020.

Jaimi Fay of Omaha, Neb., carries a flag in support of President Donald Trump outside of the Knapp Center on Thursday, Jan. 30, 2020, in Des Moines, as supporters stand in line.

Supporters of President Donald Trump don't seem to mind the cold morning air as they tailgate outside the Knapp Center at Drake University prior to Trump's visit to Des Moines on Thursday, Jan. 30, 2020.

Fletcher Christian of Columbia, S.C., stocks Make America Great Again hats at a merchandise stand near the Knapp Center at Drake University in Des Moines on Thursday, Jan. 30, 2020.

Randall Thom of Windom, Minn., holds a sign in support of President Donald Trump's reelection campaign in a parking lot outside the Knapp Center at Drake University prior to Trump's visit to Des Moines on Thursday, Jan. 30, 2020.

Supporters of President Donald Trump peruse a merchandise table in a parking lot near the Knapp Center at Drake University in Des Moines on Thursday, Jan. 30, 2020.

Walter Roach of Cedar Lake Indiana is lit by the glow of a propane heater as he and friends camp outside the Knapp Center Wednesday, Jan. 29, 2020, in preparation for Thursday's visit from President Trump.

Fort Dodge High School students Jace Ulrich, Mason Bockoven and Mason Bowman camp outside the Knapp Center Wednesday, Jan. 29, 2020, in preparation for Thursday's visit from President Trump.

A group of supporters camp outside the Knapp Center Wednesday, Jan. 29, 2020, in preparation for Thursday's visit from President Trump.

Calvin and Nancy Pembertin of Holbrook Nebraska hang banner for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.

Randal Thom and Emily Hartigan-Stein of of Minnesota set up for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.

Walter Roach of Cedar Lake, Indiana, hangs banner for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.

Trump supporters begin to decorate and camp outside the Knapp Center Wednesday, Jan. 29, 2020.

Trump supporters begin to decorate and set up camp outside the Knapp Center Wednesday, Jan. 29, 2020.

Randal Thom and Emily Hartigan-Stein of of Minnesota set up for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.

Calvin and Nancy Pembertin of Holbrook, Nebraska, hang a banner for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.

Walter Roach of Cedar Lake, Indiana, hangs banner for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.

Calvin and Nancy Pembertin of Holbrook, Nebraska, hang a banner for President Trump's visit outside the Knapp Center Wednesday, Jan. 29, 2020.