A top official at Target Corp. told federal lawmakers last week he would support a national standard for notifying customers of data breaches, pledging to work with Congress to strengthen consumer protections.

John Mulligan, Target’s executive vice president and chief financial officer, said his company would have an easier time complying with a single federal standard than the existing balkanized regulatory framework. At present, 46 states and the District of Columbia, Guam, Puerto Rico and the Virgin Islands enforce differing standards for data breach notifications, according to the National Conference of State Legis­latures.