Middle East crisis live: Rubio says US-Iran agreement ‘pretty solid’ as oil price falls amid optimism for deal

Secretary of state says a deal could materialise ‘today’, while Trump says talks with Iran proceeding constructively as he faces criticism from within his own party

Hello and welcome to the Guardian’s continuing coverage of the crisis in the Middle East.

US secretary of state Marco Rubio said on Monday that a deal to end the war with Iran could materialise “today”.