WATCH: Trump 'strongly' encourages other countries to help U.S. protect Strait of Hormuz

President Donald Trump says he's frustrated about a lack of "enthusiasm" from other countries about joining in to police the Strait of Hormuz.

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The president said at an event at the White House on Monday that "numerous countries" have told him "they're on the way" to help police the strait but he complained about their reluctance.

"The level of enthusiasm of enthusiasm matters to me," he said.

He seemed to suggest their hesitancy showed a lack of reciprocity by countries that have defense agreements with the U.S.

"I know that we'll protect them and if ever needed, if we ever needed help, they won't be there for us," he said.