Moderate Tories are said to be alarmed that the UK might be about to go back on a solemn pledge made in March in connection with the EU withdrawal agreement.
According to the Guardian, Lord John Kerr, former UK ambassador to Europe and the author of Article 50 has expressed concern that "the unicorns are back, frolicking in the Tory forest".
www.theguardian.com/politics/2019/jun/15/boris-johnson-no-deal-brexit-plan-will-trigger-early-election
I've got another 'keen'... Ouch!