Trump bravely went where no other republican candidate would go. Bush2 did get us mired in a totally unnecessary war in Iraq. Hussein was not involved in 9/11, why he became a target is because Bush2 felt that Bush1 had been humiliated by Hussein for simply hanging onto power in Iraq after the Bush1 instigated war. Trump was also right that the Iraq war destabilized the Middle East, and increased Iranian influence in the area.
And Obama withdrew troops and Iraq did not get into this mess, nor Syria as well until 2011, the Arab Spring and into 2014 with ISIS, hence, these indeed are Democratic “blame Bush” points.