The Pentagon says it is investigating Arizona senator Mark Kelly for possible breaches of military law after the federal lawmaker joined a handful of other Democrats in a video calling for US troops to refuse unlawful orders.

It is extraordinary for the Pentagon to directly threaten a sitting member of Congress with investigation. Until Donald Trump’s second presidency, the institution in charge of the US military had usually strived to appear apolitical.

In a statement Monday on social media announcing the investigation into Kelly, a veteran, the Pentagon cited a federal law that allows retired service members to be recalled to active duty on orders of the defense secretary for possible court-martial or other measures. Kelly served in the US navy as a fighter pilot before going on to

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