Twitter critics tore into the Fox News host for over-the-top praise of the former president.
The agreement will be a conspicuous show of support to Seoul amid growing concern about nuclear threats by North Korea.
North Korea has justified its weapons demonstrations as a response to the expanding military exercises between the United States and South Korea.
Its neighbors say the country has conducted its first intercontinental ballistic missile launch in a month as it extends a provocative run of weapons tests.
The country's weapons tests and U.S.-South Korea military exercises have intensified in a tit-for-tat cycle, underscoring heightened tensions in the region.
North Korea has fired two short-range ballistic missiles into the sea as the United States moves an aircraft carrier to neighboring waters for exercises with South Korea.
The dictator called for his troops to be ready to respond to the enemies’ “frantic war preparation moves."
North Korea fired two short-range ballistic missiles toward Japan in a weapons test that drew quick condemnation from its rivals.
North Korea’s Foreign Ministry on Friday threatened "unprecedently" strong action after South Korea announced a series of planned military exercises with the U.S.
Friday’s warning suggests the North's testing could resume soon over its rivals’ military training, which it views as an invasion rehearsal.