Senior leaders including party president Sonia Gandhi, party vice president Rahul Gandhi, and former prime minister Manmohan Singh held a protest near Mahatma Gandhi's statue at the parliament complex.
The protestors wore black bands on their arms.
The Janata Dal-United led by its leaders Sharad Yadav and K.C. Tyagi also participated in the protest.
On Monday, Aug 3 Mahajan suspended the Congress MPs for five days for "wilfully obstructing the business of the house" and not adhering to her repeated requests to observe the rules in the house.