Some Republicans are starting to seriously regret Donald Trump’s vice presidential nominee, Ohio Senator J.D. Vance.

It’s been only one week since Vance was nominated at the Republican National Convention, and already his own party members are expressing severe doubts about Trump’s pick. The former president’s allies have acknowledged that nominating Vance was the product of Trump’s absolute certainty that he would be able to defeat Joe Biden in November. While Vance wouldn’t do much for swing voters or independents, he would likely shore up support among Trump’s base.

But ever since Biden passed the torch to Vice President Kamala Harris, the Democratic Party’s new presumptive nominee, Republicans have begun to sour on Vance.

“The road got a lot harder. He was the only pick that wasn’t the safe pick. And I think everyone has now realized that,” one House Republican told Axios Thursday, under the condition of anonymity.

Another House Republican told Axios that Vance “doesn’t add much.”