Conversation so far:
What did Benn do in 1997?
Benn was initially somewhat sympathetic to Blair, welcoming a change of government.
What change of government?
Blair] set up a new political party, New Labour".
Why did he set up a new party?
CANNOTANSWER.
What else did Benn do in 1997?
Benn supported the introduction of the national minimum wage, and welcomed the progress towards peace and security in Northern Ireland.
What was happening in Northern Ireland?
CANNOTANSWER.
Did Benn do anything in 1998?
Benn strongly objected to the "immoral" bombing of Iraq in December 1998.

Question: Why did he object?
Self-contained rewrite: Why did Benn object to the 1998 bombing of Iraq?