But since the start of the administration, his actions have caused persistent alarm among Trump’s advisers, who worry that it is often not clear who Giuliani is representing — the president, his private clients or his own foreign policy views — in his meetings at the White House and in foreign cities, according to people familiar with the concerns who spoke on the condition of anonymity to describe internal discussions…

Federal prosecutors in New York are scrutinizing Giuliani’s business ties to the men and his consulting business as part of a broad probe, according to people familiar with the investigation.

In several conversations in recent months, Attorney General William P. Barr has counseled Trump in general terms that Giuliani has become a liability and a problem for the administration, according to multiple people familiar with the conversations. In one discussion, the attorney general warned the president that he was not being well-served by his lawyer, one person with knowledge of the episode said.