The Republican Party's presidential contenders pledged allegiance to Israel and warned of "apocalyptic" Islamic terrorism on Thursday as they courted one of America's most powerful Jewish donors.
"Some in our own party - in the news today - have actually questioned Israel's commitment to peace," said Rubio.
"Some in our own party actually call for more sacrifice from the Israeli people.
They are dead wrong, and they don't understand the enduring bond between Israel and America."
While he didn't use his name, Rubio's criticism was aimed at Trump, who told The Associated Press on Wednesday he has "a real question as to whether or not both sides want to make" Mideast peace.
"A lot will have to do with Israel and whether or not Israel wants to make the deal - whether or not Israel's willing to sacrifice certain things," Trump told AP.
"They may not be, and I understand that, and I'm OK with that.
But then you're just not going to have a deal."