did not understand the deal at the time it was signed, while Ian Paisley Jr claimed that Johnson had privately promised to "tear up" the deal after it was agreed. In September, Johnson sought to unilaterally dis-apply parts of the Northern Ireland protocol, despite acknowledging that this broke international law. The bill was rejected by the House of Lords, resulting in several provisions being withdrawn before it passed in December 2020- shortly before the protocol was due to come into effect. The implementation of the protocol, and the new regulatory hurdles had a negative effect on east–west trade, and drew strong condemnation from unionist figures, including DUP members such as First Minister Arlene Foster. Staff making the required checks were threatened, resulting in a temporary suspension of checks at Larne and Belfast ports. In February 2021, several unionist parties began a legal challenge, alleging that the protocol violated the Act of Union 1800, the bill which had originally merged Ireland with the United Kingdom, as well as the Good Friday Agreement. The challenge was dismissed in June, with the court deciding that the protocol- and other legislation in the intervening 200 years- had effectively repealed parts of the Act of Union. On March 4, the Loyalist Communities Council withdrew its support for the peace agreement- while indicating that opposition to it should not be in the form of violence. Riots erupted in loyalist areas at the end of the month, continuing until 9 April. The protocol's implementation, and opposition within the DUP, resulted in the announcement of Foster's resignation on 28 April. The Irish Times interviewed loyalist Shankill Road residents that month and found significant anger at the DUP, and accusations that the community had been "sold short" on the protocol. Foster was replaced by Paul Givan later that year, though he too resigned in February 2022 over the continued existence of the protocol. The UK government sought to re-negotiate the protocol, a prospect poorly received by EU leaders such as Emmanuel Macron. When discussing the effects of the protocol in June 2021, Leo Varadkar outlined a vision for a united Irish state with devolved representation in the North. He added "It should be part of our mission as a party to work towards it." In August 2021, Gerry Adams told the Irish Government that it should begin planning for a border poll and that one could happen within three