‘At the Berlin Wall last week. Walls work’: Treasury Department official Monica Crowley in 2015

As the world commemorates the 30th anniversary of the fall of the Berlin Wall, four-year-old tweets from a top Trump administration officials have resurfaced.

Assistant Secretary for Public Affairs for the U.S. Department of the Treasury Monica Crowley sent the two tweets on October 5, 2015. At the time, she was a Fox News contributor.

Months earlier, Donald Trump had launched his presidential campaign and had been pushing the idea of building a wall along the entire southern border -- a wall he falsely claimed would be paid for by Mexico. The country was having a national debate about the utility of such a proposal.

Here are Crowley's two tweets on the Berlin Wall: