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Biden said he would not divulge secure information, but said his expectation was that an attack could come "sooner, rather than later."
The US president has also previously called Israel's bombing in Gaza 'indiscriminate' and its military actions 'over the top.'
The app has 170 million US users.
Trump's commanding performance means he has all but clinched his third consecutive presidential nomination.
Voters in 15 states and one U.S. territory were casting ballots for president on Super Tuesday.
US negotiators had been pushing hard to get a pause-for-hostages deal by Ramadan's beginning on March 10 and top US officials were working on the issue last week..
This development has put a further chill into already bitter US-Russian relations.
Biden blamed Iran-backed groups for the attack, the first deadly strike against US forces since the Israel-Hamas war erupted in October .
The agitators repeated their call for US President Joe Biden to stop sending arms to Israel.
Trump made the comments during a campaign event in New Hampshire where he railed against the record number of migrants attempting to cross the US border illegally.