Lawyer Rudy Giuliani refused to provide documents to the House committee because he thought the Trump impeachment investigation was unconstitutional.

Jon Sale, Giuliani's representative, wrote to the House of Representatives yesterday, explaining his decision not to comply with the subpoena for documenting three House Committees to investigate President Donald Trump. "Mr. Giuliani will not comply with the request because this appears to be an unconstitutional, unfounded and illegal impeachment investigation," Sale wrote.

Sale's letter called the House of Representatives summons "excessive, burdened, and searched for documents outside the scope of a legal investigation". He asserted that these documents were protected by the agreement between the lawyer and the client as well as the executive privilege of the President.

Earlier, the US House of Representatives sent a warrant to Giuliani, Trump's personal lawyer, asking him to provide documents before October 15 to serve the presidential impeachment investigation.

This is a Democratic effort in the House of Representatives to clarify allegations of Trump's abuse of power by urging Ukraine to investigate rival former vice president Joe Biden in a phone call in July.

The Pentagon also yesterday said it could not share documents with the House of Representatives for Trump's impeachment investigation, citing legal and practical concerns. The US Department of Defense asserts that the House of Representatives has no authority to authorize impeachment investigations, and cannot present documents within an 8-day period under a subpoena.

"However, the Ministry of Defense respects the supervisory role of parliament and is willing to work with the House committee if there is a need for a suitable solution to this problem," the Pentagon said.

These are considered the latest developments around the "intellectual battle" between the White House and the US House of Representatives revolving around the impeachment of President Trump.

On October 14, former White House aide Fiona Hill testified during a 10-hour hearing, focusing on some of America's foreign policies with Ukraine. Congressman Eric Swalwell judged this was a move to reinforce the arguments for impeachment of the President, while Trump accused the Democratic Party of not being transparent when conducting an investigation behind closed doors.