by Amie Parnes and Brett Samuels - 02/21/21 6:00 AM ET✕Former Chicago Mayor Rahm Emanuel appears poised to take on a high-profile ambassadorship for President Biden, a step likely to trigger contention with progressives who’ve balked at him taking a Cabinet role.Emanuel is the front-runner to be Biden’s nominee as ambassador to Japan, sources familiar with the matter told The Hill.He’s also being considered for the post in China, but sources said Japan is the more likely landing spot for former President Obama’s chief of staff. Former State Department official Nicholas Burns is the likely...…by Amie Parnes and Brett Samuels - 02/21/21 6:00 AM ET✕Former Chicago Mayor Rahm Emanuel appears poised to take on a high-profile ambassadorship for President Biden, a step likely to trigger contention with progressives who’ve balked at him taking a Cabinet role.Emanuel is the front-runner to be Biden’s nominee as ambassador to Japan, sources familiar with the matter told The Hill.He’s also being considered for the post in China, but sources said Japan is the more likely landing spot for former President Obama’s chief of staff. Former State Department official Nicholas Burns is the likely...WW…