Senate Foreign Relations Committee Chairman Sen. Bob Corker was once considered to be President Donald Trump’s vice president and secretary of state.

‘We’ve got so many other things that we need to be focusing on right now,’ one GOP senator says of the growing nastiness.

Senate Republicans are imploring President Donald Trump and Sen. Bob Corker to end their increasingly ugly feud, fretting that it’s threatening to further hobble the party’s flagging agenda. But the tit-for-tat has shown no sign of abating.

On Tuesday, Trump took to Twitter to lambaste “Liddle Bob Corker,” after the Tennessee Republican said he worried that Trump’s belligerent foreign policy rhetoric could ignite “World War III.” Former Trump strategist Steve Bannon called on Corker to resign, while House Budget Chairman Diane Black (R-Tenn.) took Trump’s side over her home state colleague.