Normal partners in government, the hard-right DUP , are also well-represented on high-profile committees despite only having 10 MPs.
Its members will sit on the transport, international trade, Northern Ireland and defence committees among others.
What are Henry VIII powers?
Since Theresa May launched her Brexit Repeal Bill, there's been furious debate about 'Henry VIII powers'.
So what are they?
It's all to do with the difference between what us geeks call primary and secondary legislation.
Primary laws are Acts of Parliament and go through a long, line-by-line process of approval by MPs and the House of Lords.
But with secondary laws it's 'take it or leave it'. There's no chance to edit them, and in some cases (when they go through 'the negative procedure') they actually become law before MPs get to challenge them. The last time one of these was blocked was 1979.
These big differences mean primary laws are much more powerful. Quite rightly, some secondary laws can be crushed by the courts - primary laws can't.
Yet a Henry VIII power lets the PM make a secondary law that edits a primary law.
The process gets its name from the six-wived Tudor King who 'ruled by proclamation' thanks to the 1539 Statute of Proclamations.
The government claims it needs the power, which ends on 29 March 2021, to correct 'deficiencies' in EU-inspired law after Brexit.
It can't be used to change taxes or criminal offences, make laws retrospectively or change the Human Rights Act.
But even Tory MPs and a House of Lords committee have voiced fears about the powers. Labour's Keir Starmer said: "So much for taking back control."