Trump sues in bid to block subpoena from Congress

US President Donald Trump yesterday sued to block a subpoena issued by the Democratic chairman of the US House Oversight Committee that sought information about his personal and business finances.

The suit, the first salvo in what promises to be an escalating legal battle over efforts to investigate Trump by the Democratic-controlled US Congress, alleged Democrats have launched "all-out political war" on Trump and subpoenas "are their weapon of choice."

The committee's subpoena had sought eight years of documents from Mazars USA, an accounting firm long used by Trump to prepare financial statements, related to its investigation of allegations Trump inflated or deflated financial statements for potentially improper purposes.

Elijah Cummings, the House Oversight Committee chairman, issued the subpoena to the president's accountant after Trump's former lawyer, Michael Cohen, testified to Congress in February that Trump had misrepresented his net worth.

"Chairman Cummings' subpoena is invalid and unenforceable because it has no legitimate legislative purpose," Trump's lawyers said in a filing.

"Its goal is to expose Plaintiffs' private financial information for the sake of exposure, with the hope that it will turn up something that Democrats can use as a political tool against the President now and in the 2020 election," they said.

The filing is the first effort by Trump's legal team to quash multiple investigations by Democratic-led committees in Congress of Trump and his finances.

"Democrats are using their new control of congressional committees to investigate every aspect of President Trump's personal finances, businesses, and even his family," Trump's lawyers said.