(POLITICO) — Senate Democrats are increasingly divided over the bipartisan student loan rates bill blessed by leadership last week.

The bill is expected to come up for a vote as early as Tuesday and pass with strong votes from both parties, though a number of Democrats have publicly blasted the bill, including Sens. Elizabeth Warren (D-Mass.), Bernie Sanders (I-Vt.), Jack Reed (D-R.I.) and Richard Blumenthal (D-Conn.).

Reed and Sanders are trying to ensure that their alternative proposals get votes before agreeing to move forward on a bill that took weeks for bipartisan negotiators to finish. Sanders wants a vote on his amendment to sunset the bill to sunset after two years when interest rates are projected to rise while Reed wants more stringent caps on loan rates.

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