Obama Criticizes Trump Officials' Investigation of Ilhan Omar

• Former President Obama criticized Trump officials' investigation of Ilhan Omar.
• Obama described the investigation as 'appalling' and a 'transparent' effort to intimidate Omar.
• The investigation was seen as an intensifying effort by the Trump administration against the lawmaker.
• Obama's statement was made in a lengthy post on social media.
• The investigation targeted Ilhan Omar, a U.S. lawmaker.