READ: Mnuchin refuses to provide Trump's tax returns

Treasury Secretary Steven MnuchinSteven MnuchinMenendez, Rubio ask Yellen to probe meatpacker JBS The Hill's Morning Report - Presented by Goldman Sachs - Biden rallies Senate Dems behind mammoth spending plan Mnuchin dodges CNBC questions on whether Trump lying over election MORE on Friday told Congress that the department will not provide President TrumpDonald TrumpTrump takes shot at new GOP candidate in Ohio over Cleveland nickname GOP political operatives indicted over illegal campaign contribution from Russian national in 2016 On The Money — Dems dare GOP to vote for shutdown, default MORE's tax returns.

The request "lacks a legitimate legislative purpose," Mnuchin told House Ways and Means Committee Chairman Richard NealRichard Edmund NealDemocrats confront 'Rubik's cube on steroids' Biden pushes back at Democrats on taxes Want a clean energy future? Look to the tax code MORE (D-Mass.) in a letter.

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Refusing to provide the information, which House Democrats subpoenaed, will likely trigger Democrats to pursue further legal action.

The standoff is the latest escalation in House Democrats' attempts to obtain documents from the Trump administration.

Read Mnuchin's letter below: