Both Republican George Brauchler and Democrat Phil Weiser said they wouldn’t do anything to thwart recreational marijuana legalization.
ICE notifications mean federal officials requested that local police tell them when certain people are being released from jail.
While apprehensions at the U.S.-Mexico Border are at historic lows, immigration has become a top issue for Republican voters.
Detainees may arrive in Aurora from the U.S.-Mexico border or New York City, far away from family and a known place.
The rally was one of hundreds across the U.S. urging the Trump administration to reunite families.
Both said President Trump’s administration needs to work faster to reunite families and called for Congress to tackle broader immigration reform.
A Salvadoran woman living in Colorado who was separated from her daughter for two months in 2016 said it has left lasting negative effects on her child.
The Republican and Democrat from Colorado’s congressional delegation traveled separately to the U.S.-Mexico border to view detention sites and tent camps for children.
Walsh was among a bipartisan coalition of about 80 former US Attorneys opposed to the Trump administration's policy of separating children from their families.
About 70 former U.S. attorneys, including John Walsh of Colorado, call the Trump policy "dangerous, expensive, and inconsistent with the values of the institution in which we served."