WATCH: Trump holds Cabinet meeting amid Iran war, partial shutdown

President Donald Trump issued a warning to Tehran on social media to "get serious soon" on negotiating a deal to end the war. The post comes a day after Trump said a deal to end the war is near, despite Tehran's dismissal of his 15-point ceasefire plan.

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Iran has been blocking ships it perceives as linked to the U.S. and Israeli war effort from the Strait of Hormuz, but it is letting through a trickle of others through the crucial waterway. Jasem Mohamed al-Budaiwi, of the Gulf Cooperation Council, a bloc of six Gulf Arab nations, said Iran was charging for safe passage through the strait.

WATCH: Iran rejects Trump's ceasefire terms and issues own demands as war continues

Meanwhile, the U.S. was preparing for the arrival of thousands of troops that could be used on the ground in Iran.

The death toll from the war has risen to more than 1,900 people in Iran and nearly 1,100 people in Lebanon, with dozens more killed in Israel and elsewhere in the region. Thirteen US. military members have died. Millions of people in Lebanon and Iran have been displaced.

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