Former US President Donald Trump is taking legal action against his subpoena by the investigative committee into the attack on the Capitol.

Trump's attorneys filed a lawsuit in a Florida state court to challenge the panel's subpoena. In it, they argue, among other things, that the committee does not have the authority to force Trump to testify. In addition, the subpoena violates, among other things, the executive privilege of the ex-president. This is a President's prerogative to keep certain information secret.

The committee had asked Trump to be available for a multi-day questioning under oath starting Monday. It was a rare escalation. After the summons, Trump initially left open how he would react.

Trump supporters violently stormed the seat of parliament in Washington on January 6, 2021. Congress met there to formally confirm Democrat Joe Biden's victory in the presidential election. Trump had previously incited his supporters in a speech that he had been deprived of victory by massive election fraud. Five people died as a result of the riots. The committee in the House of Representatives is working on the attack.