Westlife want Robbie Williams to join the band.The Irish four-piece would love to welcome the 'Angels' singer in a trade-off for their own ex-member Brian McFadden joining Robbie's former band Take That.Nicky Byrne said: "Take That should have Brian back, and we'll have Robbie."If I was Take That I wouldn't want Robbie back."I think they're doing very well without him and Robbie's doing very well on his own."Nicky's bandmate Kian Egan can see why fans would like to see both bands reunited with their departed fifth members, but insists there is too much "politics" involved.He told British radio station Heart FM: "For a Take That fan I think it would be great to see them back together, I'd pay to see that, and perhaps for Westlife fans they would like to see the whole magic of a full five back on stage again so I can see that point of view."I would love to go and see Take That with Robbie in there but when you're actually in the band it's different, there are different politics."Robbie left Take That at the height of their fame in 1995 to forge a hugely successful solo career, while Brian quit Westlife in 2004.Remaining Westlife members Nicky, Kian, Mark Feehily and Shane Filan are set to release their new single 'Home' on Monday.