Women in the House Democratic Caucus will be wearing white during President Trump’s joint address to Congress on Tuesday in honor of women’s suffrage.

Dozens of the female lawmakers were spotted wearing white, the official color of the women's suffrage movement, during the chamber’s first votes Tuesday afternoon, including House Minority Leader Nancy Pelosi (D-Calif.), the first female Speaker.

“We wear white to unite against any attempts by the Trump Administration to roll back the incredible progress women have made in the last century, and we will continue to support the advancement of all women. We will not go back,” said Rep. Lois FrankelLois Jane FrankelA letter to Donald Trump: Fix the Iran Deal, don’t nix it Melania Trump wears white pantsuit to State of the Union Democrats planning protests for Trump’s first State of the Union MORE (D-Fla.), who chairs the Democratic Women’s Working Group and is spearheading the move to wear white on Tuesday.

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Hillary ClintonHillary Diane Rodham ClintonColorado governor teases possible presidential run Mueller asks judge for September sentencing for Papadopoulos House Judiciary Committee subpoenas FBI agent who sent anti-Trump texts MORE made a similar gesture last month, wearing a white pantsuit to Trump’s inauguration. She also wore white at other major moments during the presidential campaign, including when she became the first woman to accept a major party's presidential nomination at the Democratic National Convention in Philadelphia last year.

The protest from women in the House Democratic Caucus is one of several from Democrats surrounding Trump's first joint address to Congress. There are 66 Democratic women in the House, including four non-voting delegates. 
 
At least a dozen lawmakers are inviting young undocumented immigrants who came to the U.S. as children as their guests, along with others who are bringing people affected by the Affordable Care Act, the 2010 healthcare law Trump and congressional Republicans want to repeal and replace.

So far just one lawmaker, Rep. Maxine Waters (D-Calif.), has announced plans to boycott the speech altogether.