A challenge to Pope Francis: Go vegan for Lent for $1 million charity donation

A challenge to Pope Francis: Go vegan for Lent for $1 million charity donation

California"s Becerra warns legal challenge if Trump declares national emergency on border wall

California"s Becerra warns legal challenge if Trump declares national emergency on border wall

Barcelona challenge to prove ultimate test of Real Madrid resurgence

Barcelona challenge to prove ultimate test of Real Madrid resurgence

Newt Gingrich: Trump and the trivialists -- After State of the Union speech I challenge you to do this

Newt Gingrich: Trump and the trivialists -- After State of the Union speech I challenge you to do this

Trump facing revived chatter of possible GOP primary challenge

Trump facing revived chatter of possible GOP primary challenge

Maryland Gov. Larry Hogan says he hasn"t closed the door on a primary challenge to Trump

Maryland Gov. Larry Hogan says he hasn"t closed the door on a primary challenge to Trump

"Frozen pants" challenge has people freezing their jeans, posing them upright in the snow

"Frozen pants" challenge has people freezing their jeans, posing them upright in the snow

Polar vortex "Boiling Water Challenge" goes viral in Midwest amid subzero temperatures

Polar vortex "Boiling Water Challenge" goes viral in Midwest amid subzero temperatures

Measles outbreaks in Washington and New York challenge public health systems

Measles outbreaks in Washington and New York challenge public health systems

Jeff Flake rules out 2020 primary challenge to Trump

Jeff Flake rules out 2020 primary challenge to Trump

As Venezuela crisis deepens, US embassy faces security challenge

As Venezuela crisis deepens, US embassy faces security challenge

Will Chris Christie challenge Trump in 2020? "Never say never," former governor says

Will Chris Christie challenge Trump in 2020? "Never say never," former governor says

Jennifer Lopez unveils her flat abs after embarking on ‘no sugar, no carbs’ challenge

Jennifer Lopez unveils her flat abs after embarking on ‘no sugar, no carbs’ challenge

Tyrus admits defending Trump can be a challenge

Tyrus admits defending Trump can be a challenge

Jennifer Lopez, Alex Rodriguez ‘hungry all the time’ after cutting sugar, carbs in 10-day challenge

Jennifer Lopez, Alex Rodriguez ‘hungry all the time’ after cutting sugar, carbs in 10-day challenge

Secret Service members create challenge coin for working without pay

Secret Service members create challenge coin for working without pay

Tomi Lahren: Maybe Facebook"s "10 year challenge" is not so innocent after all

Tomi Lahren: Maybe Facebook"s "10 year challenge" is not so innocent after all

Mariah Carey dismisses 10 Year Challenge: ‘Time is not something I acknowledge’

Mariah Carey dismisses 10 Year Challenge: ‘Time is not something I acknowledge’

Woman who Robin Thicke groped in viral photo speaks out for 10 Year Challenge

Woman who Robin Thicke groped in viral photo speaks out for 10 Year Challenge

In limbo: Leftover embryos challenge clinics, couples

In limbo: Leftover embryos challenge clinics, couples