Is it permissible for a person in ihram to change his type of Hajj after declaring it at the miqat?

Question:
May Allah reward you. Honorable Shaykh, this questioner says: In the author's (may Allah have mercy on him) statement, "When the Prophet (peace and blessings be upon him) completed his sa'y at al-Marwah, he ordered everyone who did not have a sacrificial animal to exit the state of ihram, and he ordered them to exit the state of ihram completely." Does this mean that a person in ihram can change the type of Hajj he declared at the miqat?

Answer:
Yes, he changes it. He shifts from being one who combines (qarin) or one who performs Hajj alone (mufrid) to being one who performs tamattu'. He shifts to what is called the deviation of Hajj to 'Umrah.