I don't expect we'll see any Republicans willing to support his legislation, but good for Sen. Sanders for doing this: Senator Introduces Bill To End Huge Corporate Tax Giveaway:
Corporations offshoring profits costs both the federal government and states billions of dollars per year. One of the more egregious giveaways is known as “deferral,” which allows U.S. corporations to avoid paying taxes on overseas profits until they bring that money back to the U.S., giving them every incentive to leave it overseas permanently.
According to the Congressional Budget Office, “The current tax system provides incentives for U.S. firms to locate their production facilities in countries with low taxes as a way to reduce their tax liability at home,” ultimately resulting in compensation for U.S. workers being lower. Sen. Bernie Sanders (I-VT) is introducing a bill today that would end this practice and close several other corporate tax loopholes: [...]
According to the Joint Committee on Taxation, “the provisions in this bill will raise more than $590 billion in revenue over the next decade.”
Due to the proliferation of loopholes, credits, and the use of tax havens, major corporations haven’t paid the full statutory tax rate in 45 years. In 2011, the 12.1 percent effective rate that corporations paid was the lowest in 40 years.
Here's more from Sen. Sanders' site: End Offshore Tax Havens: