Several hundred Inauguration Day protesters were ready to brave much more than Chicago's frigid temperatures Monday, vowing to stand up to President Donald Trump in his second term."This is not our first rodeo," said Muhammad Sankari, an organizer with the Arab American Action Network. "We all remember what the first Trump administration looked like."We remember the racist attacks against so many communities, from the Arab and Muslim community, to the Black community, to the Latinx community, so many other immigrant communities and communities here at home," he said.Demonstrators gathered at the Federal Plaza in the Loop as Trump was being sworn in, returning to a site of frequent rallies against Trump's actions during his first term.The most immediate and palpable fears are being felt by those in the city's immigrant communities ahead of Trump's expected deportation efforts, which are expected to target Chicago. Though immigration raids didn't result in mass arrests in Chicago eight years ago, they created a chilling effect and reduced foot traffic in notable business corridors in neighborhoods with large immigrant populations.The City Council this month voted to uphold a full ban on city law enforcement's cooperation with federal immigration authorities.Martin Unzueta, a longtime immigrant rights advocate, said organizations are working to prepare immigrant communities to fight a deportation push."Undocumented immigrants pay taxes ... and are strong communities in the city of Chicago," he said.Danae Kovac, the executive director of Hana Center, an Asian American immigrant advocacy nonprofit, encouraged use of a new app called "Know Your Rights for Immigrants," which reads people's rights out loud to U.S. Immigration and Customs Enforcement agents and sends messages to emergency contacts. It's available in 16 languages, is out now in the Apple Store and will be on Android this week, she said."A big part of our fight is making sure that our immigrant communities know our rights and are equipped to exercise those rights," Kovac said. Hundreds of anti-Trump protesters rally in front of Trump Tower. Many are gearing up to oppose the new administration’s efforts to deport migrants.Ashlee Rezin/Sun-Times A lively crowd listened to speakers in Federal Plaza before marching toward Trump Tower.Volunteers handed out hand and foot warmers. Protesters bundled up under layers and face coverings. The temperature stood at 3 degrees with a windchill of minus 10.Sankari said ahead of the rally that the weather likely led many to stay home. Another protest was postponed until Saturday."If it was 80 degrees, I would have told you we would have 10,000 [protesters]," he said. "I'm not sure how many we'll have in total. But what I can tell you is we're going to bring the energy of 10,000 people."On the march, chants covered the gamut of causes: "Free, free Palestine." "No hate, no fear, immigrants are welcome here." "Black lives matter." Rallying cries against the newly inaugurated president rang as loud as any, including, "It is right to rebel. Donald Trump, go to hell," and "Donald Trump you racist clown, the movement will take you down."Rainbow flags and those of Mexico, the Palestinian territories, El Salvador, Argentina and the Philippines waved through the air alongside signs declaring, "we are not criminals," in defense of immigrants, and others advocating for LGBTQ and reproductive rights, education funding, ending U.S. military aid to Israel and stopping police misconduct.Onlookers stepped out of stores along State Street to take videos of the march. Police lined the route on foot and bicycles — though their presence was nowhere near the same as during last summer's protests during the Democratic National Convention.Rachel Plummer, 26, took the train in from Niles to participate in a large-scale protest for the first time, she said."In honor of Martin Luther King Jr. Day, and everyone being off from work and school today, I think there's something more powerful to do with your time than to just sit at home," Plummer said. She felt it was important to speak up about "climate change, the economic disparity in this country, billionaires controlling so much while everyday people have so little [and] the way that America's kind of devaluing community and groups and teaching us to be individuals at the expense of other people."We don't have much if we don't have support for each other. This event, even if everybody comes here for a different reason, it's important that we all come together to recognize we have strength all together."