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WASHINGTON (Reuters) - Republican Senator Marco Rubio, a favorite of the Tea Party movement, called on Monday for the resignation of acting IRS Commissioner Steven Miller for the agency's targeting of conservative groups for extra scrutiny.

In a letter to Treasury Secretary Jack Lew, Rubio called on Lew and President Barack Obama to demand Miller's resignation, saying, it "is clear the IRS cannot operate with even a shred of the American people's confidence under the current leadership."

(Reporting by Thomas Ferraro; Editing by Vicki Allen)