WASHINGTON — President Trump is populating the White House and federal agencies with former lobbyists, lawyers and consultants who in many cases are helping to craft new policies for the same industries in which they recently earned a paycheck.

The potential conflicts are arising across the executive branch, according to an analysis of recently released financial disclosures, lobbying records and interviews with current and former ethics officials by The New York Times in collaboration with ProPublica.

In at least two cases, the appointments may have already led to violations of the administration’s own ethics rules. But evaluating if and when such violations have occurred has become almost impossible because the Trump administration is secretly issuing waivers to the rules.

One such case involves Michael Catanzaro, who serves as the top White House energy adviser. Until late last year, he was working as a lobbyist for major industry clients such as Devon Energy of Oklahoma, an oil and gas company, and Talen Energy of Pennsylvania, a coal-burning electric utility, as they fought Obama-era environmental regulations, including the landmark Clean Power Plan. Now, he is handling some of the same matters on behalf of the federal government.