An itemized list of the trip's expenses was released after an attorney filed for the information under the Freedom of Information Law after being stymied in his efforts to see the list.
A wall that stretches underground is believed necessary to combat the proliferation of attack tunnels running under the border between Gaza and Israel.
Miri Regev of the Likud party said she circulated a questionnaire on the topic because she is proud to lead a “revolution” against boycotts. Critics say it creates a political litmus test.