Fleshing out the Wisconsin Republican senator's comments about Flight 93.
Ron Johnson's file
Recent statements involving Ron Johnson
Recent stories featuring Ron Johnson
Barack Obama's visit to Wisconsin comes in the midst of a heated campaign for the White House.
A look at our most-clicked items from December, including an oldie but a goodie.
Claims over campaign financing and Obamacare have marked the early stages of the 2016 U.S. Senate campaign.
These fact checks covered Democrats as well as Republicans, on taxes as diverse as taxes and foreign kings.
Also: Our top Scott Walker factchecks from 2015