Trump announced the deployment of the National Guard along the border in early April as part of a crackdown on illegal border crossings from Mexico. Until Congress approves funding for the construction of the border wall, the US president said, the military will help police the frontier.

The governors of Texas, New Mexico and Arizona, all Republicans, have cooperated with the plan. Brown initially approved sending some 400 troops to the border, earning praise from Trump.

Brown’s proposal for the use of troops, however, excluded any activities that could be considered helping the US Border Patrol in immigration enforcement, AP reported Monday, citing anonymous “US officials with knowledge of the talks,” who were not authorized to discuss the matter.

As examples of tasks the governor was objecting to, AP listed vehicle repairs, operations of remotely controlled surveillance cameras, and clerical work such as payroll and fuel supply.

California National Guard spokesman Lieutenant-Colonel Thomas Keegan told AP on Monday that the state had not rejected the troop deployment. Brown sent the federal government a Memorandum of Agreement outlining the restrictions on the use of troops, and is waiting for a response, Keegan said.

Talks between federal and California officials “soured” on Friday and over the weekend, AP reported, after the federal officials were presented with Brown’s document outlining the restrictions on troop functions. The anonymous officials who spoke to AP described the restrictions as “onerous.”

The governor reportedly wanted to focus more on drug and firearms smuggling and fighting transnational criminal gangs, suggesting the use of about 40 troops for marijuana eradication across California.