Iraqi forces are set to launch an offensive to drive Islamic State militants out of Anbar province.
The start of the operation - backed by Shi'ite and Sunni forces - was announced on state television, although no further details were given.
The United Nations has said that close to 25,000 people have fled the Iraqi city of Ramadi after an Islamic state attack. Funds to help them were running out and aid stocks were almost gone, the UN Office for the Coordination of Humanitarian Affairs in Iraq said.
Some 3,000 Shi'ite militia fighters have arrived at a military base near Ramadi as Baghdad moved to retake the western Iraqi city that fell to Islamic State militants at the weekend in the biggest defeat for the government since mid-2014.
Earlier Army General Martin Dempsey, chairman of the US military's Joint Chiefs of Staff, said the Islamic State's gains in Ramadi were setback for Iraqi security forces, but such setbacks were "regrettable but not uncommon in warfare".
"Much effort will now be required to reclaim the city," he added.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.