Faced with a contempt-of-court threat, Westchester’s top executive yesterday said the county will seek to reintroduce legislation barring landlords from rejecting tenants who receive federal rent subsidies.

County Executive Robert Astorino revealed his plans — a key provision of a 3-year-old fair-housing settlement — to a court-appointed monitor.

Earlier this month, federal Judge Denise Cote ordered the county to make plans to comply with an earlier court order to push “source of income” legislation. Delays prompted federal prosecutors to threaten the county with contempt of court.