To the Editor:

Re “Mueller Demands Trump’s Company Surrender Files” (front page, March 16):

Much has been written in the past year about the classical Watergate investigation standard “Follow the money.” In 2008 Donald Trump Jr. revealed, “Russians make up a pretty disproportionate cross-section of a lot of our assets.” The critical issue at this juncture is how much Russian money and which Russian oligarchs remain invested in the Trump Organization.

This is clearly one of the reasons President Trump refuses to release his tax returns, even though his lack of transparency could be turning into a national security issue. Robert Mueller’s subpoena of the Trump Organization for documents related to Russia suggests as much.

It’s becoming apparent that Congress needs to pass a law, before the next presidential election, that compels presidential candidates to release at least a decade’s worth of their tax returns and also demonstrate an ability to obtain a top-secret security clearance. The most powerful office in the world requires such a law, as a minimum level of scrutiny of those who aspire to hold it and lead our nation.

JACK NARGUNDKAR

GERMANTOWN, MD.

To the Editor:

You write, “The lawyers have advised Mr. Trump to refuse an interview, but the president has said he wants to do it, as he believes he has done nothing wrong and can easily answer investigators’ questions.”