The Republican senator from Missouri called for small businesses to be exempt from the proposed wage hike.
"Incrementally increasing a pitiful 7.25 wage to $10 over 5 yrs is a cruel joke. Poverty cannot be overcome just by $2.75/hour more," Democratic Michigan Representative Rashida Tlaib wrote.
"The $15 minimum wage itself is a compromise," said Adam Shah, policy director at Jobs With Justice.
A professor at American University said, "I think it's dead in the Senate, unless there's some miracle."
She responded Tuesday to the introduction of the Higher Wages for American Workers Act by Senators Mitt Romney and Tom Cotton.
"An $11 or $12 federal minimum wage would be much more palatable to moderate Democrats than a $15 minimum, given that the negative consequences for employment would be much less," said a Moody's Analytics economist.
"We have tens of millions of workers working for starvation wages," Sanders told reporters on Tuesday afternoon. "It is an absolute national disgrace."
Activists questioned whether the Democrat would "stand in the way" of the proposed minimum wage hike.
The Poor People's Campaign held its rally after a fruitless meeting with Manchin last week.
The bill will now head to the House floor for approval before it gets sent to the Senate.
Democrats may be poised to pass a plan increasing the federal minimum wage, but the initial increase for Americans in 25 states would only be to $9.50
The Raise the Wage Act 2021 would set a federal rate of $15 an hour but businesses are worried about what it means for their bottom line.
The California congressman has backed the push for a $15 minimum wage as part of the COVID-19 relief package.
"It's absolutely essential and I believe the Senate will do it," said Representative Pramila Jayapal.
Democratic lawmakers are pushing to increase the minimum wage to $15 an hour through President Joe Biden's $1.9 trillion coronavirus relief package.
The Poor People's Campaign's co-chair said the group planned to protest in Arizona next week.
President Joe Biden has already expressed doubt that the proposal will be included in his $1.9 trillion COVID-19 relief bill, but Democrats have drafted another proposal to obtain the first hike in minimum wage in over a decade.
The West Virginia senator said he would protect the rule governing what is allowed in budget reconciliation bills come "hell or high water."
West Virginians advocating for raising the federal minimum wage to $15 per hour complained that they are "tired of putting the filthy rich in silk beds."
The Poor People's Campaign said in a statement that a meeting with the West Virginia senator who opposes the minimum wage hike could take place as early as this week.
The last time the U.S. raised its federal minimum wage was 2009 to its current level of $7.25, although many states have a higher rate.
The Democratic senator could block the minimum wage increase in a vote on the next COVID relief bill.
The governor's proposal starts with an increase to a $12 minimum wage by July and annual raises through 2027.
Democrats celebrated the proposal's passage through committee, while Republicans warned it would cost jobs.
Good intentions don't change the fact that, if successful, the Fight for $15's biggest casualty would be the marginalized workers its champions are supposed to care about.
Rep. Ro Khanna is among those who have hit back at the Congressional Budget Office report on the impact of a higher minimum wage.
It looks unlikely that the legislation to increase the minimum wage from $7.25 to $15 will pass into law, after centrist Democrats expressed skepticism at the measure.
Some economists took issue with the "misleading" report, released on Monday by the Congressional Budget Office.