According to a picture sent by Barkat's office, the white signs read "U.S. Embassy" in English, Hebrew and Arabic.
Trump's highly-contested decision on December 6 to move the United States embassy from Tel Aviv to Jerusalem, overturned decades-long policy by recognizing the holy city as Israel's capital.
Trump made recognizing Jerusalem as the capital a campaign vow, breaking with previous presidents who believed the controversial move would kill any peace negotiations between the Palestinians and the Israelis.
Arab foreign ministers of Arab League member states had also called for worldwide recognition of Palestinian state with East Jerusalem as its capital.
Israel captured East Jerusalem from Jordanian control in the 1967 Middle East war and annexed it in a move not recognized internationally.
It appeared to leave open the possibility that he could decide to make the trip at the last minute, not as a member of the presidential delegation, but on his own, as the president.
In February, President Trump, while speaking to Israeli media, reiterated that the issue of Jerusalem is off the negotiating table.
Time and Place for Summit with Kim Jong-un is fixed
The university is the only privately funded college in North Korea and was founded in 2010 with donations from Christian groups. He's previously said the summit was planned for May or early June. 'I won't use the rhetoric now, ' he said.
Jerusalem is the eternal capital of the Jewish people - and the world is beginning to recognize this fact! Palestinian Authority President Mahmoud Abbas has been making inroads with the European Union and Russian Federation.
Palestinian officials didn't see it that way. "Jerusalem is our capital", she said.
Palestinian President Mahmoud Abbas has warned that the move would have a "disastrous impact on the peace process, on the two-state solution and on the stability and security of the entire region".
Trump said last week that he "may" go to Jerusalem for the opening himself.
Barkat's tweet comes as the new embassy is set to open in May to mark Israel's 70th anniversary.