Democratic Sen. Mark Kelly of Arizona says President Trump's decision to strike Iran leaves the U.S. in a "dangerous" moment ...

President Donald Trump wants a national missile defense system like Israel's, but Sen. Mark Kelly, D-Ariz., raised doubts that it is viable.

During his remarks in a Senate hearing today, Senator Mark Kelly got into a tense exchange with Pete Hegseth over President Trump's plan to build a "Golden Dome" missile defense system.

The next presidential election is still a few years away, but Arizona's senators could be contenders in a wide-open ...

U.S. Sen. Mark Kelly cast doubt on “the physics” of a proposed nationwide missile defense system and urged Defense Secretary Pete Hegseth to seek a viability analysis from scientists, not ...

Sen. Mark Kelly prodded Secretary of Defense Pete Hegseth for more details on the "Golden Dome" missile defense system proposed by the Trump administration. Kelly questioned if some of Hegseth's ...