Gen. David Petraeus, President Barack ObamaBarack ObamaTrump floods the zone for 100-day anniversary Trump team did background check on Flynn, knew of Turkey ties: report Trump: 'I couldn't care less about golf' MORE's pick to lead U.S. and
NATO troops in Afghanistan, has been reaching out to lawmakers in
advance of next week's Senate hearing.
Petraeus has met or spoken with 28 senators and the chairman and ranking member of the House Defense Appropriations Subcommittee ahead of Tuesday's Senate Armed Services Committee hearing.
Obama expressed his disappointment in replacing McChrystal, but the president said putting Petraeus in command would allow for a seamless transition.
Petraeus made calls to U.S. ambassadors to the region, NATO officials and Afghan President Hamid Karzai.
Petraeus collapsed when he last appeared before the committee on June 15. He walked out on his own, and blamed the fainting spell on dehydration.
Petraeus is widely expected to be confirmed quickly and by a wide margin.