- Secret Service blames the mix-up on an administrative error
- "It is obvious that there remain some within the US administration who seek to treat Sinn Fein differently," Adams says
Adams was invited to attend St. Patrick's Day celebrations on Tuesday.
When Adams arrived, he says staff informed him that there was an issue of security.
"After two decades of travelling back and forth to the USA and countless meetings in the White House with successive US Presidents, this is an unacceptable development," Adams wrote in a statement. "It is obvious that there remain some within the US administration who seek to treat Sinn Fein differently."
Adams is a prominent Catholic politician who helped broker peace in Northern Ireland and who has long been associated with the Irish Republican Army, which had ties to Sinn Fein. Today, Sinn Fein is an opposition party in the Republic of Ireland and is the second-largest party in Northern Ireland's Legislature.
The IRA admitted in 1999 to killing a number of people who became known as "the disappeared." They vanished during a 30-year conflict known as the "Troubles." That conflict was between Protestant loyalists who wanted Northern Ireland to remain part of the United Kingdom and Catholic nationalists who wanted to see the north united with Ireland.
The Secret Service said in a statement that it was sorry Adams' issue at the reception "could not be resolved in a more timely manner."
"Unfortunately, an administrative input error received by the Secret Service was not able to be rectified promptly," it read.