WASHINGTON,DC-President Bush officially responded to the latest round of London transit bombings Monday, challenging terrorists to "do their worst." Said Bush, in a televised statement from the Oval Office: " The proud and resilient people of London can take anything the forces of evil and cowardice can throw at them. They will never live in fear of you. Bring it on." Prime Minister Tony Blair thanked Bush for his comments, inviting him to visit London and ride the Underground in a show of solidarity.