A police officer who defended the US Capitol during a riot by Donald Trump supporters on January 6 has said he feared he would be crushed by the mob.
At least 535 rioters have been arrested since the attack that left five dead, including one police officer.
The assault led to the political impeachment and acquittal of Republican Mr Trump, who was accused by lawmakers of inciting the riot, a claim he has repeatedly denied.
The nine-member select committee was formed after Republicans objected to an independent commission such as the one that investigated the September 11, 2001 attacks.
The panel which has powers to summon witnesses is expected to investigate the circumstances leading up to the riot and why law enforcement bodies were ill-prepared.