WASHINGTON – As the Senate prepares to debate his trade agenda, President Barack Obama is sharpening his criticisms of a vocal opponent on the left.

In a weekend interview with Yahoo Politics, the president said Democratic Sen. Elizabeth Warren of Massachusetts is factually wrong and politically motivated in fighting his efforts to obtain “fast track” authority to negotiate trade agreements that Congress can accept or reject but not change.

The Senate faces a key procedural vote Tuesday. Warren is among those who say trade deals hurt the United States.

Obama said Warren is “a politician like everybody else.” He said he agrees with her on most topics but on trade “her arguments don’t stand the test of fact and scrutiny.”

Some Warren fans consider her largely above politics.