washington president donald trump old son donald trump jr. agree testify privately senate judiciary committee look allegations russian interference 2016 u.s. election cnn report tuesday weeks invite testify public hear july spokesmen spokeswomen committee leaders immediately respond request comment report cnn also report special counsel robert mueller issue subpoena melissa laurenza attorney akin gump law firm formerly represent trump former campaign manager paul manafort jason maloni manafort spokesman cnn say maloni spokesman mueller decline comment laurenza refer question spokesman immediately comment russia loom large first six months trump presidency u.s. intelligence agencies conclude russia work tilt last year presidential election trump favor mueller appoint special counsel may lead investigation also examine potential collusion trump campaign russia several congressional committees also look matter moscow deny meddle trump deny collusion campaign regularly denounce investigations political witch hunt trump jr. testify senate manafort lawyer subpoena cnn