The party leader says his "door is open" but the Unite union says he is "no friend of the workers".
Related stories
'Hopefully things get done': Americans react to historic political shift
Democrats win big in Texas
Democrats Plan Avalanche of Subpoenas for Trump Admin: ‘Lawyer Up’
What's the future of the Democratic party in Texas, amid historic midterm wins?
How well did polls predict the blue wave?
South Carolina winner Annie Andrews talks about her win and the path ahead