FIRST ON FOX: Sen. J.D. Vance, R-Ohio, sent a letter Wednesday to Attorney General Merrick Garland and Secretary of State Antony Blinken demanding answers regarding a recent Washington Post op-ed that he said suggested ‘open rebellion’ against the United States.

Robert Kagan, an editor at large at the newspaper, wrote a piece last week, claiming that ‘resistance’ to former President Donald Trump, should he win the 2024 presidential election, ‘could come from the governors of predominantly Democratic states such as California and New York through a form of nullification. States with Democratic governors and statehouses could refuse to recognize the authority of a tyrannical federal government.’

‘That is always an option in our federal system,’ Kagan added.

Vance wrote in his letter to Garland and Blinken that Kagan’s piece potentially violates federal law.

‘Excuse me? I must have missed that day in civics class,’ he wrote after quoting Kagan’s piece. ‘According to Robert Kagan, the prospect of a second Donald Trump presidency is terrible enough to justify open rebellion against the United States, along with the political violence that would inevitably follow.’

Vance also mentioned in his letter that Kagan is married to Victoria Nuland, who is currently serving as the Under Secretary of State for Political Affairs, and he asks whether her ‘close relationship with her husband might compromise her judgment about the best interests of the United States.’

Vance gave Garland and Blinken a Jan. 6 deadline to answer several questions, including whether the Department of Justice will open an investigation into Kagan.

‘If not, what factors counsel against such an investigation? Why were those factors inapplicable in President Trump’s case?’ he asked.

‘How does the Department of Justice distinguish between heated political rhetoric and evidence of a conspiracy to violate rights or rebel against the United States?’ he asked. ‘In the view of the Department of Justice, could a demand for ‘nullification’ or secession ‘intimidate’ a voter into changing his behavior at the ballot box?’

Fox News Digital has reached out to Kagan, The Washington Post, the State Department and the DOJ for comment.