Democrats on the US Senate Finance Committee are boycotting votes for two of President Donald Trump’s cabinet nominees, forcing a postponement.
They said they wanted more information about the financial activities of health nominee Tom Price and treasury pick Stephen Mnuchin.
Other Trump choices face votes, among them Jeff Sessions as attorney general.
On Monday the acting attorney general was sacked for questioning the legality of Mr Trump’s immigration directive.
It imposes a temporary travel ban on seven mainly-Muslim countries.
Acting Attorney General Sally Yates had been appointed by President Barack Obama.
Finance Committee Democrats told reporters outside the hearing that they were seeking more information about Tom Price’s trading in health company stock.
The Georgia Congressman has been nominated for the post of health and human services secretary in the new administration.
The senators said they were also concerned by reports of financier Stephen Mnuchin’s behaviour involving foreclosures at his former bank OneWest.
But Senator Orrin Hatch, the Republican committee chair, described the Democrats’ behaviour as “posturing and acting like idiots”, AP reported.