The wins for Trump, 69, and Cruz, 45, on Saturday were a setback
for party leaders, who have largely opposed Trump and hinted they
prefer Marco Rubio, 44, a U.S. senator from Florida who took third
or fourth in Saturday's four Republican contests.
"I think it's time that he dropped out of the race," Trump said of
Rubio late on Saturday. "I want Ted one on one."
Cruz has been predicting a two-man race with Trump for several
weeks.
On Sunday, Rubio was projected to win in Puerto Rico, his second
victory to date in nominating contests across U.S. states and
territories. CNN said that with a quarter of the votes counted,
Rubio had secured nearly 75 percent of the vote.
Ohio Governor John Kasich, 63, the only other candidate remaining
from a starting field of 17, has yet to win any state.
The competition moves on Tuesday to Michigan, Mississippi, Idaho and
Hawaii where Trump hopes to expand his lead ahead of a party
convention in July and the election to succeed President Barack
Obama on Nov. 8.
 Next up for Democrats is a contest in Maine on Sunday and a
televised debate on CNN at 8 p.m. on Sunday in Flint, a
majority-black, impoverished Michigan city that has suffered a
health crisis over a contaminated water supply.
In an interview on Sunday, Democratic front-runner Hillary Clinton,
68, played down the legal uncertainty over a federal investigation
into her use of a private email server while she was Obama's
secretary of state from 2009 to 2013.
"Well there is no basis for that," she told CBS's "Face the Nation"
program after being asked about fears in her party that she or her
colleagues from the State Department may be prosecuted. She said she
was delighted Bryan Pagliano, a technician who managed her email
system, was cooperating with a federal criminal investigation in
exchange for immunity.
Clinton's Democratic rival Bernie Sanders, 74, a U.S. senator from
Vermont, has sought to appeal to voters in Michigan, where the
decline of the auto industry has been sharply felt, by criticizing
Clinton for shifting positions on international trade deals.
CONTESTED CONVENTION?
The Republican establishment has blanched at Trump's calls to build
a wall on the border with Mexico, round up and deport 11 million
immigrants who are in the country illegally and temporarily bar all
Muslims from entering the United States.
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In an interview published in Welt am Sonntag newspaper on Sunday,
German Economy Minister Sigmar Gabriel said Trump was "not only a
threat to peace and social cohesion, but also to economic
development."
Republican leaders have been little happier with Cruz, a senator
from Texas who has alienated many senators in Washington. Cruz has
called for the United States to "carpet bomb" the Islamic State
militant group and pledged to eliminate the tax-collecting Internal
Revenue Service.
Trump still has a substantial lead in the race for delegates who
will select the presidential nominee at the party nominating
convention in Cleveland in July.
Trump said he should become the nominee even if he ends up with only
the plurality of delegates, not the outright majority that party
nominating rules require.
"I have a very fervent group of followers," he told the "Fox &
Friends" TV show on Sunday, "and they're not going to be happy if I
have the most delegates and we go there and we're a little bit short
of a number that was really an arbitrary number."
Reince Priebus, the Republican National Committee chairman, said he
thought the party's nominee would most likely be decided by voters
before the convention.
"There are no plans to undo the rules, or change the nomination
process mid-stream," he told ABC News, playing down any suggestion
of a first contested convention in decades.
(Additional reporting by Jonathan Allen; Editing by Howard Goller)
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