Thread by @NBCNews

BREAKING: Speaker Pelosi sends letter to President Trump suggesting they postpone his State of the Union address until after the government has been reopened, or deliver the address in writing, a practice that was common in the 1800s and early 1900s.

JUST IN: In tit-for-tat response, President Trump informs Speaker Pelosi via letter that her foreign trip to Brussels, Egypt and Afghanistan "has been postponed" until after the government shutdown is over, unless she uses commercial travel.

White House official says Speaker Pelosi and delegation were set to use military aircraft for foreign trip, which allowed the president to halt the movement.

The letter also reveals travel plans, including a visit to a war zone, for person who is second in line to presidency.

After Speaker Pelosi suggests that President Trump delay his State of the Union address, Trump sends Pelosi letter informing her that he's postponed her upcoming overseas trip. nbcnews.to/2TUCiFJ

House Majority Leader Hoyer says President Trump's decision to postpone Speaker Pelosi's foreign trip via military aircraft is “petty and ridiculous."

Senior White House official argues that Speaker Pelosi going on foreign trip during government shutdown would mean that she "would not have been here to negotiate any kind of deal.”

Speaker Pelosi had planned to depart around 3 p.m. ET Thursday for her overseas trip, White House official says.

Congress members who were supposed to travel with Pelosi had boarded a bus outside a House office building.

White House delegation will still attend the World Economic Forum in Davos, White House official says.

President Trump previously announced he would not attend.

Speaker Pelosi spokesperson:

"The purpose of the trip was to express appreciation & thanks to our men & women in uniform for their service & dedication, & to obtain critical national security & intelligence briefings from those on the front lines."

Speaker Pelosi spokesperson statement on President Trump postponing her foreign trip via military aircraft: nbcnews.to/2TUCiFJ

Rep. Schiff on President Trump's postponement of Speaker Pelosi's trip:

"We're not going to allow to the president of the United States to tell the Congress it can't fulfill its oversight responsibilities ... whether our government is open or closed. That work must go on."

Rep. Schiff: "The president's decision to disclose a trip that a speaker is making to a war zone was completely and utterly irresponsible in every way."

(corrects: irresponsible)