Friday morning, Fox News commentator Charles Krauthammer published a letter in the Washington Post, announcing that his cancer has returned and doctors have given him only weeks to live.

“I leave this life with no regrets. It was a wonderful life — full and complete with the great loves and great endeavors that make it worth living. I am sad to leave, but I leave with the knowledge that I lived the life that I intended,” Krauthammer said at the conclusion of his letter.

Tributes have poured in on Twitter, from Krauthammer’s colleagues at Fox News and throughout the news media world. Many lawmakers have also tweeted their respect and prayers. Below are a sampling of the many tributes that have been posted.