Republican presidential candidate, Sen. Ted Cruz smiles at a campaign stop Wednesday. ─ AP "The way he talks, it could work maybe 40 years ago. But now, it's too late. Islam is part of the country... We are already in the country. We're part of the country whether he likes it or not."
Sam Chashku, a Syrian immigrant who arrived in 1996 and married an American-born Christian woman, said Cruz's comments simply made him sad.
"We love this country. We came from nothing. They gave us everything. It's crazy. This country is built on immigrants."
Sometimes, he said, he doesn't want to tell anyone that he's Muslim because "people get offended, and I'm scared of hate crimes".
Trump, who has proposed a temporary ban on foreign Muslims entering the US, said in a CNN interview that he supported Cruz's plan.
Speaking Tuesday in New York, Cruz praised the city's former programme of conducting surveillance in Muslim neighbourhoods. He called for its reinstatement and said it could be a model for police departments nationwide.
After the 9/11 attacks, the New York Police Department used its intelligence division to cultivate informants in Muslim communities.
In a series of articles, The Associated Press revealed that authorities had infiltrated dozens of mosques and Muslim student groups. The programme was later disbanded amid complaints of religious and racial profiling.
Kamel Haddouche is overseeing the rebuilding of the Al-Tawheed Islamic Center in Jersey City, NJ It was destroyed in a fire in 2014.
He said he's met people he's sure were working for law enforcement. They would show up, talk to people and get involved in activities.
The surveillance, he said, makes Muslims feel like they are being watched and they "don't feel free".
"This is what you call a free country? It's not a free country. Especially when you are doing nothing wrong."
The Detroit suburb of Dearborn is widely known as the hometown of Henry Ford, who hired Arabs and Muslims in the early days of the Ford Motor Co. It is now one of the nation's largest and most concentrated communities of people who trace their roots to the Middle East.
Ali Najaf, a senior at the Dearborn campus of the University of Michigan, said the campaign rhetoric is concerning but also motivating. He hopes one day to run for office and tackle some of the issues separating Muslims and non-Muslims.
"Brussels has done one thing: It's made the Muslim community stand on its heel. Even innocent Muslims now feel, 'I need to fight back'," said Najaf, an Iraqi native who came to the US when he was 9.
"Nobody", he added, "wants to be on the fence anymore".