Breaking now from The New York Times:

WASHINGTON — Speaker John A. Boehner will resign from Congress and give up his House seat at the end of October, according to aides in his office.

Mr. Boehner was under extreme pressure from the right wing of his conference over whether or not to defund Planned Parenthood in a bill to keep the government open.

Source: Boehner Will Resign from Congress – The New York Times