Secretary of State Marco Rubio said that diplomats will help American officers monitor the cease-fire in Israel and Gaza. There is "no Plan B," he said.

The US secretary of state says Israel must be comfortable with participants, but it is unclear how such a force could be deployed without an understanding with Hamas.

Secretary of State Marco Rubio said that diplomats will help American officers monitor the cease-fire in Israel and Gaza. There is "no Plan B," he said.