Has the Biden Administration Resumed Building the Southern Border Wall?

A widely shared tweet from April 6 claims that President Joe Biden’s administration will “resume building the wall that Trump started.” The full tweet, which has been shared more than 6,000 times, reads as follows:
While it’s true that the Biden administration will fill in “gaps” due to some work that had been funded through “congressional authorization,” new construction on the wall is paused.
On January 20, Biden issued a presidential proclamation ending Trump’s “declaration of a national emergency at our southern border in Proclamation 9844 of February 15, 2019,” saying that “Declaring a National Emergency Concerning the Southern Border of the United States)” was “unwarranted.” In that proclamation, Biden insisted “no more American taxpayer dollars be diverted to construct a border wall.” Biden also said: “I am also directing a careful review of all resources appropriated or redirected to construct a southern border wall,” in his proclamation.