On Thursday, Trump hit back and canceled Pelosi's undisclosed plan to visit US troops in Afghanistan along with a congressional delegation, effectively blowing the cover for what is normally a secret trip. Here's a look at the factors surrounding Trump's move to keep Pelosi and other lawmakers from using military transport during the shutdown. In his letter, Trump argued that the trip would prevent Pelosi from entering negotiations to end the shutdown. In his letter to Pelosi, Trump said that she was free to fly commercial. Overnight, the State Department updated its security threat assessment for the trip, according to Pelosi's office , deeming it to be more dangerous because of Trump's decision to make the trip public.

Source: CNN January 18, 2019 22:06 UTC