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Reid: Senate vote on Lew expected this week

GOP senators have questioned Lew's private-sector experience with both Citigroup and New York University, and the former White House chief of staff's role in previous fiscal negotiations.

But Lew's nomination has not sparked the kind of criticism that another of President Obama's high-profile nominees, Chuck HagelCharles (Chuck) Timothy HagelHagel: Trump is 'an embarrassment' Tax cut complete, hawks push for military increase Pentagon documents hundreds of serious misconduct cases against top brass MORE, has received. The Senate is expected to hold a procedural vote Tuesday on Hagel's nomination for Defense secretary.

Democrats have said that Lew has been exceedingly transparent during his nomination process, and believe he should be confirmed without issue.

Obama nominated Lew to replace Timothy Geithner, who left the Treasury Department in January.  

Sen. Orrin HatchOrrin Grant HatchOvernight Tech: Uber exec says 'no justification' for covering up hack | Apple considers battery rebates | Regulators talk bitcoin | SpaceX launches world's most powerful rocket Overnight Cybersecurity: Tillerson proposes new cyber bureau at State | Senate bill would clarify cross-border data rules | Uber exec says 'no justification' for covering up breach Hatch introduces bipartisan bill to clarify cross-border data policies MORE (Utah), the ranking Republican on the Finance panel, declined to say Monday how he would vote on Lew's nomination. 

But Hatch did say that, if Lew cleared the committee fairly easily on Tuesday, he didn't see any reason to slow walk the nomination.

"If he comes out of committee, I don't see any reason why anybody would want to continue to put it off," Hatch said. "I can't speak for all my colleagues. All I can say is, we'll see what happens in committee tomorrow."

Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsDems pick up deep-red legislative seat in Missouri Grassley to Sessions: Policy for employees does not comply with the law New immigration policy leaves asylum seekers in the lurch MORE (R-Ala.), perhaps the chamber's most vocal critic of Lew, continued to blast the nomination on Monday, saying Lew did not have the "gravitas" to be a good Treasury secretary.

But Sessions would not say whether he would push to delay a full Senate vote on the nomination. 

This post was updated at 6:45 p.m.