Japan's Prime Minister has joined the European Union, Canada and President Obama in criticizing possible protectionist trade policies on American goods being discussed as part of the U.S. economic stimulus plan.

Japan's prime minister Taro Aso made comments about his concerns on Tuesday after it was revealed that certain provisions of a nearly $900 billion stimulus package requires that steel and other goods in infrastructure products to be in the U.S.

'Buy American' is definitely wrong, Aso said in Parliament today, according to Bloomberg. It's clearly against the spirit of the World Trade Organization to say you must use American steel to make bridges.

President Barack Obama warned Tuesday against inciting a trade war.

I think we need to make sure that any provisions that are in there are not going to trigger a trade war, Obama told in a television interview, Reuters reported

The governments of the European Union and Canada sent letters to Congress urging that the offending provisions be removed, according to Reuters.