Toby Ziegler's diplomatic push to invite Sinn Féin leader Brendan McGann to the White House, clashing with British Ambassador John Marbury's firm opposition rooted in IRA history and security concerns.

Toby Ziegler's diplomatic push to invite Sinn Féin leader Brendan McGann to the White House, clashing with British Ambassador John Marbury's firm opposition rooted in IRA history and security concerns.