Sen. Bernie Sanders (D-VT) speaks during a press conference to discuss legislation for a 15 dollar minimum wage, on Capitol Hill, May 25, 2017 in Washington, DC. 31 Democrats have pledged to support the legislation so far.

Bernie Sanders plans to reintroduce legislation this week to raise the federal minimum wage to $15 an hour, the liberal Vermont senator announced on Monday.

"The federal minimum wage of $7.25 is a starvation wage," Sanders tweeted. "If you work 40 hours a week, you should not live in poverty."

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The bill will likely die in Congress even as it gives Sanders a key issue to push on the campaign trail if he runs for president in the 2020 race, as he is widely expected to.

Sanders, an independent who caucuses with Democrats in the Senate, introduced similar legislation in 2015 and 2017, but both bills were stalled in Congress. With Democrats now controlling the House, the odds of a similar measure passing that chamber are higher. House Speaker Nancy Pelosi has expressed her support of a $15 minimum wage in the past. Yet, Republicans hold a 53-47 advantage in the Senate, which effectively dooms the bill's chances.

A representative for Sanders did not immediately respond to CNBC's request for additional comment.

The legislation being reintroduced by Sanders, who describes himself as a democratic socialist, previously counted several Democrats as co-sponsors, including potential 2020 presidential contenders Sens. Elizabeth Warren of Massachusetts, Kamala Harris of California, Cory Booker of New Jersey and Kirsten Gillibrand of New York.

The federal minimum wage has remained at $7.25 an hour since 2009, even as 29 states and Washington, D.C., have adopted a higher rate, according to data from the Economic Policy Institute.

Sanders, who challenged Hillary Clinton in the 2016 Democratic primary race, has historically supported the "Fight for $15" movement, which was first initiated by fast-food workers in 2012 and has since come into the mainstream. Three states and even more cities, including New York, have committed to increasing their minimum wage to $15 an hour.

Opponents of a wage hike say a $15 minimum wage would pressure businesses to raise prices or cut staff to offset new costs. Sanders' bill would gradually raise the minimum wage to mitigate any shocks to the economy, reaching $15 an hour in 2024, according to a statement.

In October, Amazon boosted its minimum wage to $15 an hour after a pressure campaign from Sanders, benefiting more than 250,000 employees. Sanders and Amazon CEO Jeff Bezos exchanged pleasant messages on Twitter after the company announced the increase.

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Sanders has also called on Walmart and McDonald's to raise their wages.