The US president ordered flags on public buildings to be flown at half-mast as a mark of respect.
Former US president, Donald Trump, added: “Bob Dole was an American war hero and true patriot for our Nation. He served the Great State of Kansas with honour and the Republican Party was made stronger by his service.”
Former president George W Bush described Mr Dole as a man who represented the finest of American values.
“He defended them in uniform during World War II. He advanced them in the United States Senate. And he lived them out as a father, husband, and friend.”
Republican Senate leader, Mitch McConnell, added: “Whatever their politics, anyone who saw Bob Dole in action had to admire his character and his profound patriotism.
“Those of us who were lucky to know Bob well ourselves admired him even more.”