Arizona Attorney General Mark Brnovich published a letter Wednesday to Treasury Secretary Janet Yellen after she threatened, on behalf of the Biden administration, to withhold funds from the state due to a difference in COVID-19 policy.

"Madam Secretary, the states created the federal government, not the other way around," Brnovich wrote. "Unfortunately, members of the Biden administration have continuously ignored this fundamental principle of our great nation when proposing and enacting bureaucratic mandates and harmful regulations upon individual states."

ARIZ AG MARK BRNOVICH: BIDEN'S VACCINE MANDATES, OTHER ABUSES MUST BE STOPPED BY THE STATES

Arizona Attorney General Mark Brnovich

Arizona Attorney General Mark Brnovich (AP Photo)

"It shouldn't surprise anyone that the U.S. Department of Treasury, under your leadership, is again trying to overstep its constitutional bounds and dictate to Arizona how our state should run and fund our schools," Brnovich continued in the reply.

The Biden administration informed the state Friday it must stop withholding federal funding from schools with mask mandates or the department may take back over $160 million of coronavirus relief money the state designated for schools

Brnovich firmly repudiated the administration's threat, threatening swift legal action if pushed.

"Other states and state officials may not push back against federal overreach, but rest assured, my office will fight every day to defend Arizona's sovereignty and the cherished constitutional liberties of our constituents," Brnovich wrote.

Treasury Secretary Janet Yellen

Treasury Secretary Janet Yellen makes a speech at the U.N. climate summit in Glasgow, Scotland, Nov. 3, 2021. (AP Photo/Alberto Pezzali)

Former President Trump continued his "Save America" tour Saturday with an event in Arizona, where he scrutinized President Biden and endorsed local Republican candidates.

The former president did not reveal if he would be running for president again in 2024 – a hope for many of his supporters – but continued to point out what he described as Biden's mishandling of the U.S.-Mexico border, the coronavirus pandemic, and record-high inflation, FOX 10 of Phoenix reported.

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"We've had more problems, we've had more destruction, than five presidents put together in the last year," Trump told the crowd in Florence, about 62 miles southeast of Phoenix.

Fox News's Tyler Olson and Lawrence Richard contributed to this report.