They are not inclined to complain, not about the merciless sun or the 110-degree heat, as they labor to transform the pale sands of the Arabian desert into verdant fairways. They accept with resignation that their families are far away, in India, Pakistan or Nepal.

What these migrant workers cannot abide is how frequently their employer, a local construction company, pays them late, delaying the money they send home and forcing their families to borrow. They are especially frustrated given where they have been dispatched to work — the Trump International Golf Club, part of President Trump’s global array of business interests.

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“We really don’t want to be in a situation where senior government officials are thinking about how much money they are going to cost themselves by enforcing U.S. government policy,” said Robert W. Gordon, a law professor at Stanford and an expert on conflicts of interest, referring to Mr. Trump’s public role and private business. “We are talking here about the head of the U.S. government personally benefiting from lax labor standards in another country.”