A White House spokeswoman says lawmakers aren't "smart enough" to assess President Donald Trump's tax returns.
The Committee's Saturday letter to the IRS reiterated their position, saying Mnuchin should not be concerned. "Those concerns lack any merit", Chairman Richard Neal (D-MA) wrote.
When asked by CNN, the secretary told reporters that the Treasury's Department's legal office has been in consultation with the Justice Department's lawyers.
"The president heard the idea, he likes it", she said. "And I think it's more important to the American taxpayers that we get this right than we hit an arbitrary deadline".
"I don't know whether it's legal or illegal".
Ilhan Omar, a Democratic lawmaker from Minnesota, has been at the center of an escalating row following a speech she made about Islamophobia in which she was accused by conservatives of downplaying the deadliest attacks on United States soil by characterizing the event as "some people did something".
Trump then went into a days-long Twitter tirade against Democratic mayors of "sanctuary cities" and disingenuously accused members of the "radical left" of suddenly not caring for migrants. The IRS has already missed the April 10 deadline Neal set in his initial request.
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Hundreds of US cities, along with California, the country's most populous state, have declared themselves as havens for migrants who have illegally crossed the southern USA border with Mexico, refusing the help USA immigration officials to track down the immigrants so they can be deported.
On Monday, lawmakers in NY proposed a bill that would allow the commissioner of the state's Department of Taxation and Finance to turn over state tax returns if requested by certain congressional committees. "The legal implications of this request could affect protections for all Americans against politically-motivated disclosures of personal tax information, regardless of which party is in power". With the administration determined to deny the request, experts say only courts can now resolve the issue.
Trump claimed it wouldn't make sense to release his tax returns while, he said, they are under audit. These cities, which are designated as safe havens for illegal immigrants, mandate that their law enforcement not cooperate with federal immigration authorities.
Trump appears prepared to fight this to the Supreme Court. Democrats argue that 6103 requests are made all the time and are routinely handled through the IRS, not under the supervision of the treasury secretary.
Congressional Republicans have condemned Neal's request as a political fishing expedition by Democrats, while the White House has said the documents will "never" be turned over.
Democrats have seized on the issue of Trump's undisclosed taxes since taking control of the House of Representatives - citing a little-known law that allows Congress to review anyone's returns to conduct an investigation.