WATCH: Republicans try to stop Elijah Cummings from listing guilty Trump officials at Strzok hearing

Republican lawmakers unsuccessfully tried to stop Rep. Elijah Cummings (D-MD) from listing the guilty pleas by Trump campaign officials obtained by special counsel Robert Mueller.

Cummings called out GOP lawmakers for promising not to interfere with the Mueller investigation, but he said they had recently changed course.

"Now they're doing the opposite. behind closed doors, they're asking individuals involved in the Russia investigation hundreds of questions about confidential human sources, FISA applications and potential witnesses in the special counsel's criminal probe," Cummings said. "In public, they're holding emergency hearings, issuing unilateral subpoenas and threatening contempt and impeachment. They even demanded that the top Justice Department law enforcement officer in charge of this investigation said, and I quote, 'Finish it the hell up.'"

"So what has changed?" Cummings continued. "What has changed?"

Interns held up five large posters showing the faces of three Trump campaign officials and two campaign associates who have pleaded guilty to charges in the special counsel probe.

"Let me underscore, these are not allegations -- these are admissions," Cummings said. "Trump's national security adviser admitted that he committed these crimes."

Cummings then moved on to Rick Gates, the president's deputy campaign chairman, who also pleaded guilty to crimes in the Mueller probe, when committee chairman Bob Goodlatte (R-VA) cut his microphone.

Goodlatte questioned whether the signs were appropriate, but Cummings and other Democratic lawmakers asked him to cite a rule against them.

The Virginia Republican was unable to do so, and Cummings continued with his list.