Immigration crackdown in Maine is a top issue in battle for key Senate seat

Demonstrators attend an anti-ICE rally in Lewiston, Maine, on Jan. 24. On Jan. 21, federal immigration authorities from Immigration and Customs Enforcement (ICE) launched a new enforcement operation in Maine called Operation Catch of the Day, aimed at identifying and arresting undocumented immigrants.

President Trump's immigration policy is complicating Republicans' attempts to maintain control of Congress. A recent crackdown in Maine, for instance, put the focus on GOP Sen. Susan Collins.

(Image credit: Joseph Prezioso)