Mr. Kushner, who organized the president’s Middle East stops at the start of the foreign trip, chose to return to Washington with several days to go and has been unusually subdued since then. But he has no plans to step down from his role as senior adviser or to reduce his duties, according to people close to him.

Still, there are signs that he is tiring of the nonstop combat and the damage to his reputation. He has told friends that he and his wife have made no long-term commitment to remain by Mr. Trump’s side, saying they would review every six months whether to return to private life in New York…

Ms. Trump and Mr. Kushner have complained privately about what he views as an unfair level of scrutiny of his actions. He has dismissed the attention on him as a reflection of his father-in-law’s unconventional approach to diplomacy and inexperience in government, rather than anything nefarious he has done. People close to Mr. Kushner were adamant on Saturday that he was preparing for a long fight and not an exit from the White House.