Zimbabwe ? President Robert Mugabe threatened Sunday to expel the U.S. ambassador for providing advice to the opposition opponent in the upcoming presidential runoff.

Mugabe, speaking at the formal launch of his campaign for the June 27 runoff, said Ambassador James McGee had publicly urged opposition leader Morgan Tsvangirai to return to Zimbabwe to lead his embattled supporters. Tsvangirai returned Saturday after more than six weeks abroad.

“As long as he carries on doing that, I will kick him out of the country,” Mugabe said of McGee, a Vietnam War veteran. “I don’t care if he fought in Vietnam. This is Zimbabwe, not an extension of America.”