US Congresswoman Rashida Tlaib is said to join presidential candidate Senator Bernie Sanders at a rally in Detroit, Michigan, this weekend and announce her endorsement of the Vermont independent.

Sanders’ presidential campaign made the announcement on Tuesday, adding that the rally in Tlaib's birthplace will be joined “by local leaders and activists fighting for economic, environmental and racial justice, and against the corporate assault on working families across America.”

Tlaib, a member of the group of four progressive freshman lawmakers known as “the squad,” would fortify Sanders’ left flank with her endorsement at a time when Representatives Alexandria Ocasio-Cortez (D-N.Y.) and Ilhan Omar (D-Minn.) — two other “squad” members — have already endorsed the 78-year-old presidential candidate.

Representative Alexandria Ocasio-Cortez (D-NY) endorses Democratic presidential candidate, Senator Bernie Sanders (I-VT) at a campaign rally in Queens bridge Park on October 19, 2019, in the Queens borough of New York City. (Photo by AFP)

Omar confirmed her decision to endorse Sanders in a statement and a video posted on her Twitter page last week, saying she was "one of the people that was inspired by the movement that the senator has built."

"One of the amazing things I think about the senator is that he understands we have to find solutions to our greatest problems. We don't wait for what the poll numbers are on proposing a particular solution," Omar said in the clip.

.@BernieSanders isn’t fighting to win just one presidential election -- he’s fighting for the soul of our democracy.



Here’s more on why I’m so proud to give Bernie my endorsement for president of the United States: pic.twitter.com/1NLMPnzS1x — Ilhan Omar (@IlhanMN) October 16, 2019

Ocasio-Cortez also threw her support behind Sanders at a massive rally in New York on Saturday, which was the senator’s first since he suffered a heart attack earlier this month.

The lawmaker emphasized Sanders’ history in fighting for progressive causes and called for a concerted effort to defeat the US incumbent president in the 2020 election.

Today I am endorsing Senator @BernieSanders for president.



In the end, we must come together to defeat Donald Trump. We should do so knowing he is a symptom of a larger problem - and our greatest hope is a multiracial, working class movement in the United States of America. pic.twitter.com/9fiTS7FTX9 — Alexandria Ocasio-Cortez (@AOC) October 19, 2019

US President Donald Trump triggered a firestorm back in July after he tweeted that the four progressive members of the US House of Representatives should “go back” where they came from, even though all are US citizens and three are US-born.

Trump's attacks were widely seen as a bid to rally his right-wing base at the risk of inflaming racial tensions and deepening partisan divisions in America before the 2020 White House race.

Sanders still polls in the top three of most national and statewide surveys and has so far raised $25.3 million in the third quarter of 2019, the most of any candidate.