White House senior adviser Kellyanne Conway has defied a subpoena and failed to appear at a congressional hearing about allegations she violated the Hatch Act, a law that limits federal employees' political activity.
The top White House lawyer directed Conway not to appear at the US House of Representatives oversight committee hearing, arguing that current and former White House officials were "absolutely immune" from being required to testify before Congress, according to a letter released by the committee.
Three weeks ago, Conway declined to appear voluntarily at a similar hearing before the committee, prompting it to vote 25-16 to subpoena her testimony.
Past presidential administrations from both parties have adopted similar arguments but some legal experts have said such immunity claims would be rejected by a judge if challenged in court.
The White House said in a statement that Monday's hearing was part of a "purely political campaign to harass the president and his close advisers".
President Donald Trump is stonewalling multiple congressional inquiries into him, his policies, family and business holdings.
The Office of Special Counsel, a US government watchdog agency, last month recommended Conway be fired for repeatedly violating the Hatch Act by disparaging Democratic presidential candidates while speaking in her official capacity during television interviews and on social media.
Australian Associated Press