Spokesman said Bosco Ntaganda tried to 'influence the chain of command' but went too far in challenge to Sultani Makenga.
U.S. spokesperson says Washington trying to meet the warlord's request to be transferred to the ICC.
Villagers say they saw a half dozen trucks with Rwandan soldiers cross into Congo to lend support to troops led by a wanted rebel leader.
Should help avoid jeopardizing the delicate peace process.
Political head of the M23 rebellion ousted by the group's military leader over charges he's aiding Bosco Ntaganda, a wanted war criminal.
M23 military chief predicts Friday withdrawal from seized lands.
The rebels said they will withdraw if President Joseph Kabila's government meets their demands for wide-ranging national reforms and negotiations.