I binged your worry using “Rubio supports IMF World Bank”.
Here are the results:
http://www.bing.com/search?q=rubio+supports+IMF+World+Bank&form=APMCS1
I chose CNS link and read the article.
Rubio Praises U.N., World Bank, IMF for Not Asserting ‘Narrow American Interests’
It is not what you think.
“(CNSNews.com) – Sen. Marco Rubio (R-Fla.), who was elected to his first term with help from the Tea Party in 2010 and who is sometimes cited as a potential GOP vice presidential pick, lauded the United Nations, the World Bank, and the International Monetary Fund (IMF) for following their respective visions instead of asserting “narrow American interests” in a speech today on U.S. foreign policy.
“In remarks at the liberal Brookings Institution in Washington, D.C., Rubio sketched the advances made globally since the end of World War II as a result of America’s leadership.
“That vision and will helped other nation's attain liberty, kept trade routes open, supported “the expansion of free market capitalism that accelerated the growth of the global economy,” he said, “and we did it without coveting other countries’ territories or seizing their assets or robbing them of their opportunities.”
It would behoove you to read the whole article. I just copied the portions that pertained to your points. Rubio is explaining why the US, after WW2 was the main pusher of the UN, IMF and World Bank to minimize another WW3. At that time the US believed that WW2 began because of the break down of the League of Nations. Also there was no world market for “equal opportunity” purchasers of commodities (oil, wheat, corn, rice, etc.). Japan was in search of oil, iron, etc. for its growth. Japan felt it could not purchase what it needed so it attacked nations that either prevented Japan from its goals or had natural resources. Similarly with Germany. Germany wanted the Russian oil fields, the Suez Canal etc. The US thought if all countries had access (open trade routes such as the Straight of Hormuz and the global oil market) to commodities there would be less probability of another WW. The IMF and World Bank helps with liquidity. You need some type of entities to help smooth over the vast difference between the 1st tier and the 2nd and 3rd tier countries.
Maybe those entities were useful in the past (and that is debatable) but they are currently viper pits of leftist/globalist nastiness. So if Rubio does not say (and I don’t see him say) that his praise is only for the past, then my opinion still stands. Anyone who thinks the UN is not a nasty pit of leftist vipers is insane.