Weekend Roundup

On this edition of the CBS News "Weekend Roundup," President Biden takes executive action to battle what he calls an "epidemic" of gun violence, following a string of mass shootings over the past few weeks, including one that happened hours after his announcement on Thursday. Host Allison Keyes begins our coverage with CBS News White House Correspondent Steven Portnoy. Meanwhile, CBS's Jeff Pegues, who has been covering some of those attacks, has been checking in with his law enforcement sources to see if there is any way to stop them. Britain's Prince Philip, the husband of Queen Elizabeth II, died Friday at the age of 99. CBS's Vicki Barker reports from London. There are concerns over the Johnson and Johnson vaccine, after incidents of dizziness and other reactions have been reported, causing two states to pause distribution of those vaccines. We get the latest from CBS News Medical Contributor Dr. David Agus. CBS News has been covering the fallout from the sharp increase in immigration at th