Senate Majority Leader Harry ReidHarry Mason ReidStrange bedfellows: UFOs are uniting Trump's fiercest critics, loyalists Bottom line Biden's first 100 days is stylistic 'antithesis' of Trump 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 HarkinWe need a voting rights workaround Romney's TRUST Act is a Trojan Horse to cut seniors' benefits Two more parting shots from Trump aimed squarely at disabled workers 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 CollinsOvernight Health Care: Supreme Court takes case that could diminish Roe v. Wade | White House to send US-authorized vaccines overseas for first time White House: Biden committed to codifying Roe v. Wade regardless of Miss. case CDC's about-face on masks appears politically motivated to help a struggling Biden 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 PryorBottom line Everybody wants Joe Manchin Cotton glides to reelection in Arkansas 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.