A newly appointed U.S. envoy says she hopes Lebanese authorities are committed to making sure that the Hezbollah militant group is not a part of the new government in any form.

On her first official visit to Lebanon, US Deputy Special Envoy for the Middle East Morgan Ortagus on Friday said the US had drawn a red line against Hezbollah's inclusion in a future Lebanese government.

The United States has set a "red line" that Shi'ite armed group Hezbollah should not be a member of Lebanon's next government after itr military defeat by Israel last year, U.S deputy Middle East envoy Morgan Ortagus said in Lebanon on Friday.

President Donald Trump's envoy is set to deliver a firm message to Lebanese leaders during a visit on Thursday: the U.S. will not tolerate the unchecked influence of Hezbollah and its allies over the formation of a new government.