Portland, Oregon (CNN) - Rep. Paul Ryan, the GOP vice presidential candidate, sided with Chicago Mayor Rahm Emanuel on Monday in the strike by unionized Chicago teachers and urged President Barack Obama to stand behind his former chief of staff.
"Rahm and I have not agreed on every issue or on a lot of issues, but Mayor Emanuel is right today in saying that this teachers' union strike is unnecessary and wrong," Mitt Romney's running mate said at a campaign fund-raiser in Portland, Oregon.
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"We know that Rahm is not going to support our campaign, but on this issue and this day we stand with Mayor Rahm Emanuel," Ryan continued.
The Chicago Teachers Union, which represents nearly 30,000 teachers and support staff in the nation's third-largest school district, called the strike after negotiators failed to reach a contract agreement with school administrators despite eight months of talks.
White House spokesman Jay Carney said on Monday that Obama had yet to make an assessment on the walkout, but that the president's chief concern is for students and families affected by the strike.
Ryan urged Obama to take a stance on the labor tumult in his hometown.
"This does not have to divide the two parties," Ryan said. "And so we're going to ask, where does President Obama stand? Does he stand with his former chief of staff Mayor Rahm Emanuel, with the children and the parents, or does he stand with the union? On issues like this, we need to speak out and be very clear."
Earlier Monday, Romney released a statement expressing disappointment in the union's decision to strike, saying the group was putting self-interest ahead of students and parents. He also implicated Obama, saying the president has long sided with the unions, which are reliable sources of Democratic political donations. Unlike his running mate, Romney did not explicitly state his support for Emanuel.
Emanuel said he did not view Romney's remarks as helpful.
"While I appreciate his lip service, what really counts is what we're doing here and I don't give two hoots about national comments scoring political points or trying to embarrass or whatever the president," Emanuel said at a news conference.
Republicans have gone after public sector unions as a budget-cutting strategy in certain states and have demonized them as part of a broader attack on organized labor.