The House Judiciary Committee subpoenaed the Department of Homeland Security (DHS) for materials related to allegations that President Donald Trump promised pardons to officials involved in building the border wall.

Judiciary Chaiman Jerrold Nadler (D-N.Y.) issued the subpoenas on Wednesday, Sept. 4, asking DHS Secretary Kevin McAleenan to provide documents related to meetings in March and April between him and the president in which pardons may have been discussed.

“The dangling of pardons by the president to encourage government officials to violate federal law would constitute another reported example of the President’s disregard for the rule of law,” Nadler said in a statement.

The House committee said the subpoena represents another step for the Democrats to determine whether to recommend articles of impeachment. It also requires documents related to possible pardon offers involved to the wall being constructed on the southern border.

Last week, The Washington Post reported that President Trump had promised aides he’ll pardon them, should they break the law to get the border wall built more quickly and complete the project before the 2020 election. But one anonymous White House official said the president was joking.

President Trump denied the reporting, saying that was “another totally Fake story” by Washington Post and it was made up “only in order to demean and disparage – FAKE NEWS!”

The House committee gave McAleenan a deadline of Sept. 17, the same day of three other subpoenas issued to former White House aides, including former campaign manager Corey Lewandowski and former officials Rich Dearborn and Rob Porter.