President Obama fired another volley in the summer-long war of words with Minority Leader John Boehner (R-Ohio) in a Labor Day address to a union crowd in Milwaukee.

While not referring to Boehner by name, Obama clearly referred to the man who is eyeing the speaker's dais should Republicans take control of the House in November midterm elections.

"When we passed a bill earlier this summer to help states save the jobs of hundreds of thousands of teachers, nurses, police officers and firefighters that were about to be laid off, they said 'no' to that, too," Obama said. "In fact, the Republican who’s already planning to take over as Speaker of the House dismissed them as 'government jobs' that weren’t worth saving."

That was soon followed by another dig.

"How do you like that — middle class families footing tax breaks for corporations that create jobs somewhere else!" the president said. "Even a lot of America’s biggest corporations agreed the loophole should be closed, that it wasn’t fair — but the man with the plan to be Speaker is already aiming to open it up again."

In early July, Boehner compared the Wall Street reform bill to "killing an ant with a nuclear weapon." Obama shot back at a town hall event, "He can't be that out of touch with the struggles of American families." The White House tweeted Obama's remarks, and Boehner fired back via Twitter soon after. Boehner then accused Obama of spending "an awful lot of time making excuses and whining about others."

Late last month, Boehner dialed up the attacks on the White House, calling on Obama to ask for and accept the resignations of Treasury Secretary Timothy Geithner and Larry Summers, head of the National Economic Council. Vice President Joe Biden mockingly said "[that was] very constructive advice, and we thank the leader for that."

The tangles between the president and party leader are expected to intensify even further as Democrats face an uphill climb in crucial midterm elections.