Washington (CNN) House Democrats are demanding documents on President Donald Trump's promotion of his Miami resort for next year's G7 summit and Vice President Mike Pence's recent stay at Trump's Ireland golf property that was hours away from where he conducted official business.

The House Oversight Committee and the House Judiciary Committees this week sent a series of letters requesting documents and other information from the White House, the Vice President's office, the US Secret Service and the Trump Organization about the two matters.

"The Committee does not believe that U.S. taxpayer funds should be used to personally enrich President Trump, his family, and his companies," wrote Oversight chairman, Democratic Rep. Elijah Cummings of Maryland.

The requests are part of the Judiciary committee's decision to broaden its probe into the President as the committee decides whether to bring articles of impeachment against Trump. The committee is already investigating the President for potential obstruction of justice, possible corruption, among other issues.

"Potential violations of the Foreign and Domestic Emoluments Clauses of the Constitution are of grave concern to the Committee as it considers whether to recommend articles of impeachment," wrote Judiciary Committee Chairman Jerry Nadler and Democratic Rep. Steve Cohen, who chairs the Subcommittee on the Constitution, Civil Rights and Civil Liberties.