A man‘s "Honk If Cornyn Broke His Oath" sign got lots of responses Wednesday evening outside Austin City Hall.

Drivers blared their horns as they passed by the group of roughly 85 protesters who gathered to criticize the U.S. senators who had voted earlier in the day to acquit President Donald Trump of the impeachment charges against him.

Texas‘ two GOP senators, John Cornyn and Ted Cruz, were among Trump’s most visible defenders during the impeachment process. Cornyn is up for election this year, and the protesters said they would not be voting for him.

"We have to stand up together and let our voices be heard," said Karan Shirk, who helped organize the protest.

Shirk said she believes Texas‘ senators broke their oath last month, as Trump's impeachment trial began, to uphold "impartial justice."

"We have all listened to the same information, but they predetermined what their votes should be," she said.

Trump‘s acquittal followed months of impeachment proceedings. On the first article of impeachment, abuse of power, the vote was 52-48 in favor of acquittal. The second, obstruction of Congress, also produced a not guilty verdict, 53-47.

Only one Republican, Mitt Romney of Utah, the party’s defeated 2012 presidential nominee, broke with the GOP. All Democrats found the president guilty on the two charges.

Austin protesters called out chants Wednesday evening, including "we have the power" and "vote them out!"

Anna Nguyen held up a sign Wednesday evening that said "Lock Him Up." On the other side of her sign was an illustration of Trump dressed as a clown.

"We have to be visible," Nguyen said. "People need to know we won‘t stand for this."