Senator Mitch Romney voted to convict President Trump on the first article of impeachment, abuse of power, Wednesday.

Andrea Cabral, former secretary of public safety and sheriff of Suffolk County, joined Boston Public Radio on Thursday to explain why she is proud of Romney for voting against his own party's president in an impeachment trial.

"I was proud of [Romney]," she said. "I just don't understand how anyone with a heart or a brain can support Donald Trump."

Trump is able to get away with authoritarian behavior due to his supporters in Congress, Cabral said.

"[Trump] could not eviscerate all of the norms he's eviscerated without a lot of help and the help comes, first and foremost, by his friends in the House and the Senate," she said. "That, in some ways, makes what Mitt Romney did yesterday all the more glaring since ... he laid bare their culpability and complicity in all of this."

Cabral is the former secretary of public safety and sheriff of Suffolk County. She is currently the CEO of Ascend.