He was a prominent member of the opposition during the governments of Rafic Hariri; in particular to Nassib Lahoud, Salim Hoss, Omar Karami, Mohammad Youssef Baydoun and Hussein Husseini.

In 2000, he broke his alliance with Nayla Moawad and Omar Karami, and allied himself at the election booth with Soleiman Franjieh Jr, and the Tripoli Bloc of Mohammad Safadi and Najib Mikati.

[6] In 2001, as one of the founding members of the Qornet Shehwan Gathering,[7] he strongly expressed his opposition to the policies of the Hariri government and to Syrian hegemony.

In 2004, Harb participated, with Nayla Moawad, Omar Karami, Salim Hoss, Hussein Husseini and Albert Mansour, in the creation of a National Face for Reform.

Harb commented that he had been warned by Lebanese security forces that they had found "bomb detonators in a lift" at his Beirut office.

[11] Majd is a lawyer that ran for the 2022 Lebanese general election almost defeating Gebran Bassil in Batroun and has also attempted to prosecute Hezbollah for financial crimes through Al-Qard Al-Hasan Association.