New Delhi:Eighteen opposition parties will meet once a month to discuss various crucial issues and maintain better coordination among themselves to challenge the government collectively. 

TMC leader Derek O'Brien has made an announcement to that effect after a meeting of the opposition parties to decide on their vice-presidential candidate. 

"The Congress party and we have agreed that we will hold such meetings once every month," he said. 

The TMC leader said various key issues such as farmer suicides, the fallout of the Goods and Services Tax (GST) and demonetisation, and the role of some governors were discussed in the meeting. 

These issues are likely to be raised in the upcoming Parliament session. 

Some of the opposition parties have accused Puducherry Lieutenant Governor KiranBedi and West Bengal Governor KeshariNathTripathi of compromising on constitutional propriety.

The Congress earlier alleged that the role of governors appointed by the NDA government had been questionable, be it in Arunachal Pradesh, Uttarakhand, West Bengal or Puducherry.

The opposition leaders also unanimously condemned the government for targeting all the opposition parties, be it LaluYadav's RJD in Bihar, the Congress or the AamAadmi Party.

O'Brien said this issue would also be raised in Parliament. 
The Trinamool Congress leader said there was "good opposition coordination" on the vice-presidential election and that it was likely to continue. The opposition parties has fielded former West Bengal governor Gopalkrishna Gandhi as their candidate for the post of the vice-president.