British Prime Minister Theresa May told business leaders in Northern Ireland on Tuesday that she is seeking changes to the U.K.’s withdrawal agreement with the European Union, but not the total removal of the Irish border provision that is the most contentious part of the deal. Seeking to ease fears about the return of customs posts and vehicle checks, May said during a visit to Belfast that the British government is committed to preventing the construction of a physical border between EU member Ireland and the U.K.’s Northern Ireland after Britain leaves the European Union.