The poster read "Sanctions are Coming" - a play on the "Winter is Coming" motto of the show - and was probably aimed at Iran, though it can sometimes be hard to figure out who Trump is trying to punish economically.
A few Game of Thrones actors also expressed their disapproval of Trump's power.
But in November he had tweeted a picture of the poster, with the date of Nov. 5, to announce that sanctions against Iran, which had been repealed when President Barack Obama signed a nuclear agreement with the country in 2015, were going to be reimposed.
A new Democratic-controlled House of Representatives was sworn in on Thursday; it passed a bill to reopen the government agencies without earmarking cash for the border wall.
U.S. President Donald Trump leads a meeting of his Cabinet, including Health and Human Services Secretary Alex Azar, acting Interior Secretary David Bernhardt, and acting Defense Secretary Patrick Shanahan, in the Cabinet Room at the White House, on January 02.
"Hello, everybody. This is a attractive place". I've never seen it in my life, sorry.
"I think Joffrey is now the king in America", Martin said a year ago.
In uncharacteristically warm words for Pelosi, one of his frequent targets on Twitter, he congratulated her on her "tremendous, tremendous achievement" after Democrats won 40 House seats in November elections. A lot of bad things are happening. "And I know they want to do that very badly", Trump said.
The president is now locked in a battle with Democrats in Congress over funding for the U.S. -Mexico border wall, a standoff which has led to a government shutdown.
Trump, however, appeared to indicate he could choose another term other than a wall - which has been a key promise from his 2016 campaign as he denounced immigration.
Like the Night's Watch struggling to find distinguished soldiers to man the wall, the USA agency tasked with border security is struggling to attract qualified applicants. "It won't work", Trump said.
HBO wasn't impressed when the "sanctions are coming" poster was released, telling MSNBC at the time: "We were not aware of this messaging and would prefer our trademark not be misappropriated for political purposes".
"We didn't have physical barriers there, and illegal immigration and drug smuggling was absolutely out of control".