He had been speaking in a debate with MEPs on the state of play of the Brexit negotiations earlier today.
European Parliament President Antonio Tajani said: "As far as the European Parliament is concerned, the principles governing our future relations are clear: single market integrity must be preserved, a third country can not be treated more favourably than an EU member state and a level playing field is essential".
Talks regarding the Irish border remain a critical issue in Brexit negotiations, where there is now no clear plan on how to avoid the customs and sanitary checks.
A legal challenge to force Theresa May to concede a second European Union referendum has been launched by anti-Brexit campaigners. Nowhere is this more evident than in the draft legal text on Northern Ireland and the Republic of Ireland, which this resolution supports. It would be disastrous for Northern Ireland economically and it violates the principle of consent - a core principle of the Belfast Agreement.
An agreement on customs will be needed: May refers to two proposals already put to the EU.
European Council President Donald Tusk angered the DUP last night after insisting that it would be "Ireland first" in the EU-UK negotiations over Brexit.
Trump could win Democrats' support as Republicans consider blocking tariffs
Senator Pat Roberts, the Kansas Republican, described the tariffs as a "tax on consumers" in a statement Thursday night. President Trump has reiterated that he is not "backing down" on the tariffs.
The Ulster Unionist MEP Jim Nicholson gave a similar reaction to the proposals.
One of the big Brexit sticking-points centres on the border between Ireland and Northern Ireland.
As Brexit talks appear to have hit an impasse particularly over what happens to the border between Ireland and Northern Ireland, International Trade Secretary Liam Fox told United Kingdom business leaders Thursday that Brexit can work for all concerned if discussions are focused on economic matters rather than politics.
"And I do believe that rationality, common sense will win the day if we conduct ourselves with decorum and patience and I think therefore it's in all our interests to keep the temperature down". It ensured an open border where communities, people, and goods could freely cross from one side to the other: now, this border is nearly invisible.
The Irish government has said ideas in a report about "smart borders" would not be enough to prevent a hard border after Brexit. "We can only achieve this if all sides work together".
Jolyon Maugham QC told BI that he is being "realistic" about the case, but said the European Union is 'based on the rule of the law, and if the law gives me the right to retain my European Union citizenship, or a Dutch resident the right to retain her citizenship, then that is what the law is'.