More Republicans defect from Trump's border emergency as the president wails impotently on Twitter

Sen. Mitt Romney (R-UT) on Thursday announced that he would break with President Donald Trump and vote for a resolution of disapproval against his decision to declare a national emergency to secure funds for his long-promised border wall.

"I am seriously concerned that overreach by the Executive Branch is an invitation to further expansion and abuse by future presidents," Romney said in a statement obtained by CNN's Dana Bash. "We experienced a similar erosion of congressional authority with President Obama's unilateral immigration orders -- which I strenuously opposed."

According to CNN's Phil Mattingly, Romney marks the sixth GOP senator to go on record voting against Trump in his border wall emergency, joining fellow Republicans such as Sens. Susan Collins (R-ME) and Lisa Murkowski (R-AK).

Romney's defection came just minutes after Trump angrily tweeted against GOP senators who planned to vote against him on his national emergency declaration.

"Today’s issue is BORDER SECURITY and Crime!!!" Trump wrote in one tweet. "Don’t vote with Pelosi!"

"A vote for today’s resolution by Republican Senators is a vote for Nancy Pelosi, Crime, and the Open Border Democrats!" he wrote in another.