The Pentagon says it's opening an investigation into Arizona Sen. Mark Kelly in the wake of a video of Democratic lawmakers urging servicemembers not to comply with 'illegal orders."

President Donald Trump seized on the video last week and accused Kelly and the five other Democrats in it of sedition, “punishable by death.” He also reposted “hang them,” sparking widespread outrage that he was calling for their executions.

The Pentagon said Monday that it has received “serious allegations of misconduct” against Sen. Mark Kelly (D-Ariz.) and has initiated a “thorough review” of the allegations. It comes days after the senator, along with a handful of other lawmakers ...

"Our laws are clear. You can refuse illegal orders," Kelly, D-Arizona, told members of the military in the video that enraged Trump.