Lawrence O’Donnell airs hard-hitting expose on Trump, Jr -- and the president tweets ‘presidential harassment’

MSNBC anchor Lawrence O'Donnell on Tuesday broadcast a hard-hitting segment on Donald Trump, Jr. for defending his father against claims of rape -- despite the fact his own mom made similar allegations.

The host attempted to understand why Sen. Lindsey Graham (R-SC) and Trump, Jr. are so obedient to Trump when they both used to despise him.

O'Donnell noted a tweet by Trump, Jr. on the latest allegations against his father.

Moments after the segment ended, the president tweeted.

Watch: