READ: Mnuchin refuses to provide Trump's tax returns

Treasury Secretary Steven MnuchinSteven Terner MnuchinThe Hill's Morning Report: How will Trump be received at G-7? White House won't move forward with billions in foreign aid cuts Trump says he'll decide on foreign aid cuts within a week MORE on Friday told Congress that the department will not provide President TrumpDonald John TrumpThe Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch To ward off recession, Trump should keep his mouth and smartphone shut Trump: 'Who is our bigger enemy,' Fed chief or Chinese leader? MORE's tax returns.

The request "lacks a legitimate legislative purpose," Mnuchin told House Ways and Means Committee Chairman Richard NealRichard Edmund NealDemocrats push judge for quick action on Trump tax returns lawsuit Trump argues NY tax return case should take place in DC NY files motion to keep Trump tax returns lawsuit out of DC court 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: