Sen. Rick Scott (R-FL) rekindled his feud with Mitch McConnell (R-KY) on Tuesday with an op-ed accusing the Senate minority leader of “undermining” the Republican Party with a border compromise that has been panned by conservatives.

Scott, who unsuccessfully challenged McConnell for his leadership role last February and has been a thorn in his side ever since, criticized the Senate GOP leader in an editorial for the Hill over his support for the proposed border deal, which would be paired with funding for Ukraine.