By his inviting a foreign leader to address Congress, John Boehner deliberately dealt in foreign policy and thus violated the "Logan Act", thus usurping the powers of the presidency of the United States.
By law, he must now be tried by Congress, and forced to resign.
The Logan Act (1 Stat. 613, 30 January 1799, currently codified at 18 U.S.C. § 953) specifically forbids any unauthorized citizens from negotiating with foreign governments.
The Act is intended to prohibit United States citizens without authority from interfering in relations between the United States and foreign governments.
It was passed in 1799 and last amended in 1994.
Violation of the Logan Act is a felony, punishable under federal law with imprisonment of up to three years.