WASHINGTON — Michael T. Flynn, President Trump’s first national security adviser, may have violated federal law by not fully disclosing his business dealings with Russia when seeking a security clearance to work in the White House, top House oversight lawmakers from both parties asserted on Tuesday.

The revelation came after Representative Jason Chaffetz, Republican of Utah and chairman of the House oversight committee, and other lawmakers on the panel examined classified documents related to Mr. Flynn, including a form he filled out in January 2016 to receive his security clearance. The form is known as an SF-86 and is required by anyone in the government who handles classified information.

As part of the review, Representative Elijah E. Cummings of Maryland, the committee’s senior Democrat, said Mr. Flynn did not disclose in those documents payments totaling more than $45,000 that he received from the Russian government for giving a speech in Moscow in 2015, among others.

The development is the latest trouble for Mr. Flynn, who also did not disclose payments from Russian-linked entities on a financial disclosure form that the Trump administration released in late March. Earlier in March, Mr. Flynn filed papers acknowledging that he worked as a foreign agent last year representing the interests of the Turkish government, causing another uproar and more unfavorable headlines for the Trump administration.