O’Halleran & USMCA: What’s the deal?

What’s the deal with O’Halleran and the USMCA? 

While other vulnerable Democrats pressure Pelosi to bring the bill up for vote, O’Halleran remains silent.

The USMCA would be a big win economically for Arizona, including AZ-01. Even Arizona’s Democrat Senator Kyrsten Sinema supports the USMCA.

Why won’t O’Halleran support the trade deal?