Republican Sen. Susan Collins of Maine says her decision on whether to endorse Donald Trump, as well as for other Republicans, will likely be influenced by one major key factor: who he chooses as his running mate.

“This evolves daily. There are surprises daily. And I’m going to see what happens at the convention,” Collins told David Axelrod on “The Axe Files” podcast. “It’s going to be very important to me whom Donald Trump chooses as his running mate. That is arguably the most important decision that a candidate can make.”

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Collins claims she wants to see if Trump’s vice presidential pick will “balance out some areas in foreign policy where he does not have experience.” Collins has been a critic of Trump, and has even alluded to thinking about voting for Hillary Clinton like some other major Republicans, but she reaffirms the VP choice could sway her over.