Federal prosecutors have stepped up their investigation of prominent Washington attorney Gregory Craig for work he conducted at his former law firm on behalf of the Ukrainian government in 2012, an effort coordinated by Paul Manafort.

The investigation of Craig — a White House counsel for President Barack Obama — along with lobbyists Vin Weber and Tony Podesta, has shaken Washington’s lobbying and legal community, which until recently had faced little scrutiny of its representation of foreign clients.

“There is a rising level of concern, particularly from law firms providing services to foreign governments,” said Joshua Ian Rosenstein, an expert on foreign lobbying registration compliance at the Sandler Reiff law firm.

Since Manafort’s plea deal, Rosenstein said the volume of calls he has received on the topic has spiked.

“New and existing clients are asking very specific questions now” about the rules and regulations governing representation of foreign governments, he said.

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