What are 'American Nostradamus' Allan Lichtman's predictions for US midterm polls?

'American Nostradamus' Allan Lichtman, the historian who predicted President Donald Trump's victory in 2016, defying all mainstream pollsters, has predicted the victory of Democrats in midterm elections. Democrats have a 90% chance of regaining control of House while a 70% chance of taking back the Senate, he said. He identified Maine, North Carolina, Ohio and Texas as potential Democratic gains.