Vehicles at the port of Larne, Northern Ireland, Tuesday, Feb. 2, 2021. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff. (AP Photo/Peter Morrison)

The European Causeway ferry from Scotland at port in Larne, Northern Ireland, Tuesday, Feb. 2, 2021. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff.(AP Photo/Peter Morrison)

Vehicles leave the port of Larne, Northern Ireland, Tuesday, Feb. 2, 2021. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff.(AP Photo/Peter Morrison)

A P&O worker closes the gate on the European Causeway ferry from Scotland in the port of Larne, Northern Ireland, Tuesday, Feb. 2, 2021. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff.(AP Photo/Peter Morrison)

A man walks past graffiti reading "No Irish sea border" in the mainly loyalist Donegal road area of South Belfast, Northern Ireland, Saturday, Jan. 30, 2021. Graffiti has appeared across Loyalist areas in Northern Ireland in recent days as anger grows relating to the Northern Ireland protocol and the row over vaccines across the border into Northern Ireland. The European Union has introduced tighter rules on exports of coronavirus vaccines that could hit shipments to nations like the United Kingdom amid a deepening dispute with drugmaker AstraZeneca over supplies of potentially lifesaving shots. The measure created an outcry Friday in Northern Ireland amid fears it would trigger controls on vaccines shipments produced in the 27-nation bloc. (AP Photo/Peter Morrison)

Vehicles leave the port of Larne, Northern Ireland, Tuesday, Feb. 2, 2021, after arriving from Scotland. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff. (AP Photo/Peter Morrison)

Vehicles leave the port of Larne, Northern Ireland, Tuesday, Feb. 2, 2021, after arriving from Scotland. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff. (AP Photo/Peter Morrison)

FILE - In this file photo dated Friday, Jan. 1, 2021, lorries and cars disembark from a ferry arriving from Scotland at the P&O ferry terminal in the port at Larne on the north coast of Northern Ireland. Authorities in Northern Ireland suspended post-Brexit checks on animal products arriving at Larne Port, Tuesday Feb. 2, 2021, citing threats made against border staff. (AP Photo/Peter Morrison, FILE)

Vehicles at the port of Larne, Northern Ireland, Tuesday, Feb. 2, 2021. Authorities in Northern Ireland have suspended post-Brexit border checks on animal products and withdrawn workers after threats against border staff.(AP Photo/Peter Morrison)