The Hill News

Sen. John McCain (R-Ariz.) took to Twitter on Friday to say that he has "serious concerns w/ some provisions" of the tax legislation unveiled by Harry Reid (D-Nev.).

The bill, introduced Thursday, leaves President Obama's compromise largely unaltered but adds tax credits for alternative energy, energy-efficient homes and other "green" efforts. These provisions aim to soothe liberal Democrats who oppose the deal's extension of tax cuts for the wealthy.

McCain, who in late November co-signed a bipartisan letter to end ethanol subsidies, appears to take issue with their inclusion.

#1 goal [of the deal] is 2 prevent tax increases-not carving out deals 4 special interests," he tweeted.

A "test vote" on the bill is scheduled for Monday afternoon.

Read more about the bill here.