Mike Mohring, the CDU leader in the eastern state of Thuringia, told the daily Die Welt that he expects the CSU to give Merkel two weeks to find a European solution. "For the government", wrote the mass-circulation newspaper Bild on Sunday.
As of last week, it looked like the interior minister would go ahead with these plans with or without the Chancellor's support, potentially forcing her to sack him and thus break the three-month old coalition keeping her government together.
The CSU's top priority is a hard October state election in Bavaria in which it is trying to tamp down support for the anti-migration Alternative for Germany party.
He said, if Merkel's negotiations on getting other countries to take back migrants don't bear fruit, he will talk with her party but "I want be able to put this into effect".
How it would be funded was also up for discussion with other eurozone members, said Merkel, suggesting that it could involve regular transfers made by individual countries or a tax on financial transactions.
And 86 percent want faster deportations of rejected asylum seekers, a process now often held up by bureaucratic hurdles and legal challenges, according to the Infratest dimap poll. But also, anor recent survey, this time from RTL indicates that 68% of respondents believe that CSU's demand to set new limits on immigration responds to an electoral strategy.
Seehofer will on that day seek CSU party backing to use his ministerial authority to order border police to turn back the asylum seekers, in open defiance of Merkel. "We finally want to have a solution for the return of refugees at our borders which is fit for the future", he added.
But Mrs Merkel opposed to this move, claiming Germany will follow the EU's immigration laws.
Signalling that he is leaning towards the latter option, Seehofer wrote in a column in Frankfurter Allgemeine Zeitung that "it is essential that the European Union summit takes a decision at the end of June".
Whichever option he chooses, the ball will land in Merkel's court.
Central and eastern European Union nations such as Hungary and Poland have either refused outright or resisted taking in refugees under an European Union quota system that has essentially floundered. In 2016, he threatened Merkel's federal government with a lawsuit if it didn't take measures to further secure the border. On Sunday night on Monday, Merkel had met with her collaborators during a seven-hour meeting.
Macron past year outlined his vision for a stronger, more united Europe as a forceful reply to what was known as the National Front, a far-right party he defeated at the polls. This same Monday afternoon, Italian prime minister, Giuseppe Conte, will visit Berlin, where as German government has advanced will address immigration issue.
According to Reuter, the spokesman denied a report in Bild newspaper that Merkel was trying to arrange a special summit on migrant policy, saying such a meeting would be a matter for European Union institutions.
CDU General Secretary Annegret Kramp-Karrenbauer, widely seen as Merkel's preferred successor, said the two parties agreed on the aim of minimising the number of migrants registered elsewhere and coming to Germany but disagreed on how to achieve it.