The White House on Tuesday escalated President Trump’s feud with Sen. Bob Corker (R-Tenn.), saying the senator was partially responsible for the Iran nuclear deal.

“Senator Corker worked with Nancy Pelosi and the Obama administration to pave the way for that and rolled out the red carpet for the Iran deal,” White House press secretary Sarah Huckabee Sanders said at a briefing.

Corker’s office said the claim is “not true” and that the Tennessee Republican opposed the Iran deal and worked with lawmakers to craft a bill ensuring Congress could review the deal, against the Obama White House’s wishes.

“He worked with them on the legislation that rolled that out,” Sanders responded. “That’s what helped I think put things in motion. He may have voted against the deal ultimately, but he not only allowed the deal to happen, he gave it credibility. I stand by my statement.”