Texas Gov. Greg Abbott strongly opposed a proposal that could shift members of the Air National Guard to roles in the Space Force without the consent of their respective governors.

In a letter to President Biden, Abbott, who has clashed with the commander-in-chief on a number of matters, said the proposal is an "intolerable threat" to the National Guard. 

"That proposal would give the Secretary of the Air Force unilateral authority to transfer Air National Guard units to the Space Force — without first obtaining gubernatorial consent," Abbott wrote in the May 3 letter. 

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On Monday, he called it a "power grab."

The Republican governor argued the measure would sideline governors as the commander-in-chiefs of the National Guard in each state and U.S. territory.

"By departing from this sensible arrangement, and allowing the Secretaries to dismantle National Guard units on a whim, Legislative Proposal 480 would set a dangerous precedent," he added. "Members of the Texas National Guard must always stand ready to respond to natural disasters, civil disturbances, and cartel activity that threaten our way of life."

Fox News Digital has reached out to the White House. 

In April, Abbott and dozens of other governors wrote Defense Secretary Lloyd Austin calling for the discontinuation of LP480. 

They argued it would weaken or limit their authority and threaten readiness and the efficiency of National Guard units.