McGuinness was an early activist in the Northern Ireland Civil Rights Association. Later, joined the Irish Republican Army, which was leading an armed insurrection against British rule in Northern Ireland.
The senior Protestant politician in Northern Ireland left the door open Sunday for stepping aside as part of a potential deal to revive the British territory's unity government with Catholics.
"The church is in a different space," says Archbishop Martin. "We must be more invitational, using a ministry of presence, gently explaining the message of the church and inviting people in."