Chicago's top cop was back in the Windy City on Tuesday after visiting with President Barack Obama and Vice President Joe Biden at the White House a day earlier.
He said the meeting with the leaders and other law enforcement officers from around the country was a "wonderful experience" that dealt with "significant issues."
McCarthy said he pressed for laws that would keep guns out of the hands of criminals in Chicago.
"This was the real point that I brought up to the president and the vice president: the requirement to report the loss, theft or transfer of a firearm. Because without it we're facilitating straw purchases," McCarthy said Tuesday.
In addition to the gun registry, McCarthy is also pushing for a ban on assault weapons and high-capacity magazines, and he has called for universal background checks and mandatory sentencing for illegal gun possession.