Former President Donald Trump’s campaign has requested a series of additional security measures, including military assets, in conversations with the White House and the Secret Service because of continuing threats to his safety, according to four people briefed on the matter.

The conversations came amid suggestions from some Trump aides that they felt hamstrung from having Trump campaign the way they would like to because of the security threats, including his ability to travel where he wants and appear outside at rallies.

In exchanges with White House chief of staff Jeff Zients and the acting Secret Service director, Ronald L. Rowe Jr., in the past two weeks, Susie Wiles, Trump’s top campaign adviser, said Trump had been forced to move, reschedule or cancel key events because of limits on the service’s available resources, according to the people.

The campaign’s requests for more security, one of the people said, included sophisticated, classified military assets that are used only for sitting presidents; the preplacement of ballistic, or bullet-resistant, glass in the main battleground states where he would be campaigning most frequently.

The Trump team in effect is looking for him to be protected at the same level that President Joe Biden is. Trump’s team has been told that he is being given the highest level of protection available, though no candidate or former president receives what a sitting president does.

Trump has been the target of two would-be assassins in the past four months, as well as an alleged murder-for-hire plot involving someone with ties to Iran. The campaign has been briefed by the intelligence community about active interest from Iran in harming Trump.

On Wednesday, Rep. Michael Waltz, R-Fla. and a member of the House’s task force investigating the assassination attempts on Trump, wrote a letter urging Defense Secretary Lloyd Austin and other senior administration officials to provide military transport planes to Trump.

Waltz, a former Green Beret, wrote that although such aircraft were in high demand, “protecting the life of a former president and major third-party presidential nominee merits their use for the less than one month remaining until the presidential election.”

A senior official in the Defense Department said it “continues to provide enhanced support to the U.S. Secret Service for the protection of the 2024 presidential and vice presidential campaign candidate.” A Secret Service spokesperson noted that the Pentagon was already providing military cargo planes to the agency to help it move heavy equipment required by the Trump campaign.

In her own push for additional security resources, Wiles cited several episodes that showed the need for more help, a person familiar with the matter said.

They included one event in Wisconsin, where the campaign had encountered a shortage of Secret Service agents because they were busy handling the U.N. General Assembly in New York.