Sen. Tammy Duckworth, D-Ill., called for Defense Secretary James Mattis to testify before Congress regarding the reasons behind his resignation.
Her comments came in two tweets posted after his resignation.
Duckworth, an Army veteran, wrote: “Secretary Mattis should testify before Congress and answer questions about the alarming contents of his resignation letter.”
And in another tweet, she added: "Congress should use its power to check this president, defend our alliances and hold our adversaries accountable when Donald Trump refuses to.”
In his letter of resignation to Trump, Mattis had written he believed it was right to resign.
“We must do everything possible to advance an international order that is most conducive to our security, prosperity and values, and we are strengthened in this effort by the solidarity of our alliances,” he said.
“Because you have the right to a secretary of defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position."
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