Senate Majority Leader Harry ReidHarry Mason ReidDems search for winning playbook Dems face hard choice for State of the Union response The Memo: Immigration battle tests activists’ muscle MORE (D-Nev.) on Monday moved to hold a vote this week on increasing the federal minimum wage.

Reid filed cloture on the motion to proceed to legislation from Sen. Tom HarkinThomas (Tom) Richard HarkinOrrin Hatch, ‘a tough old bird,’ got a lot done in the Senate Democrats are all talk when it comes to DC statehood The Hill's 12:30 Report MORE (D-Iowa) that would increase the minimum wage from $7.25 to $10.10 per hour.

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The vote will be a major test of unity for Senate Democrats, who have made the wage hike central to their populist agenda for the midterm elections. 

Some vulnerable Democrats up for reelection have expressed concern about the wage increase, citing a Congressional Budget Office report that Harkin’s bill would harm job growth. Some of them have come out in support of a smaller increase to $9 an hour, proposed by Sen. Susan CollinsSusan Margaret CollinsDemocrats search for 51st net neutrality vote Overnight Tech: States sue FCC over net neutrality repeal | Senate Dems reach 50 votes on measure to override repeal | Dems press Apple on phone slowdowns, kids' health | New Android malware found Overnight Regulation: Dems claim 50 votes in Senate to block net neutrality repeal | Consumer bureau takes first step to revising payday lending rule | Trump wants to loosen rules on bank loans | Pentagon, FDA to speed up military drug approvals MORE (R-Maine).

If Democrats were to stick together on the wage vote, they would need at least five Republicans to vote with them to advance the measure. 

But Republicans are unified against it, which has put pressure on Democrats to minimize defections in their 55-member caucus.

Sen. Mark PryorMark Lunsford PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.) has said he’ll vote against the increase to $10.10 per hour, but other vulnerable Democrats up for reelection have signaled they would support it.

Most Democrats are insisting on the $10.10 wage level because they say it would lift all full-time workers out of poverty.