Mr Blair has pledged the UK's support for war with Iraq but the prime minister knows that he still has to win the support of many of his own MPs - and the voters.
Anxiety makes us afraid of where we are are going; that we could lose something, miss an opportunity, or be inadequate. It makes us fear losing someone we love.
After his premiership, Mr Blair, now 68, became a Middle East envoy and set up his own non-for-profit group, the Tony Blair Institute for Global Change.