The Secret Service has vacated its command post inside Trump Tower in Manhattan following a dispute between the government and President Trump’s company over the terms of a lease for the space, according to two people familiar with the discussions.

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The details of the dispute between the Trump Organization and the Secret Service were not clear Thursday. Two people familiar with the discussions said the sticking points included the price and other conditions of the lease.

Secret Service Director Randolph "Tex'' Alles, in an interview with USA TODAY, said more than 1,000 agents have already hit the federally mandated caps for salary and overtime allowances that were meant to last the entire year.

The agency has faced a crushing workload since the height of the contentious election season, and it has not relented in the first seven months of the administration. Agents must protect Trump – who has traveled almost every weekend to his properties in Florida, New Jersey and Virginia – and his adult children whose business trips and vacations have taken them across the country and overseas.

"The president has a large family, and our responsibility is required in law,'' Alles said. "I can't change that. I have no flexibility.''

(...) Overwork and constant travel have also been driving a recent exodus from the Secret Service ranks, yet without congressional intervention to provide additional funding, Alles will not even be able to pay agents for the work they have already done.

The compensation crunch is so serious that the director has begun discussions with key lawmakers to raise the combined salary and overtime cap for agents, from $160,000 per year to $187,000 for at least the duration of Trump's first term.

But even if such a proposal was approved, about 130 veteran agents would not be fully compensated for hundreds of hours already amassed, according to the agency.