Democratic Senator John Fetterman delivered a video address at the Republican midterm convention in Dallas, praising fellow Pennsylvania senator Dave McCormick, a Republican, and briefly referencing his willingness to work with President Trump on steel industry issues. The gesture provoked a furious reaction from within his own party, further fuelling speculation about Fetterman's increasingly strained relationship with the Democrats, despite his repeated insistence that he has no plans to defect.

Fetterman has previously said the one issue that could push him to leave the Democratic Party is if it turned against Israel, a stance he reiterated at The Hill's Nation Summit in July, noting that 103 of 211 House Democrats had voted against Israel aid that month. He also confirmed Republicans had privately approached him about switching parties, though he declined to give details, and he has defended Trump administration actions such as the strike on Iran. Fetterman and McCormick jointly formed a political committee, Common Ground PA, over the summer, and despite polling suggesting he is more popular with Pennsylvania Republicans than with Democrats, Fetterman has repeatedly stated he remains committed to staying a Democrat.