US president contradicts his own aides, GOP leadership, who insist remaining American soldiers will continue fight against Islamic State

Following death of terror leader, Washington makes further moves to protect area's oil fields from extremists, Syria, Russia

Experts doubtful whether new plans to secure oil fields amid troop withdrawal are realistic, or even legal

Deployment will likely include tanks; Esper does not give details on troop numbers but says despite Trump vow to bring soldiers home, many will be repositioned