WASHINGTON - President Donald Trump on Monday announced Brett Kavanaugh as his nominee for the US Supreme Court, picking a conservative federal appeals court judge who survived a previous tough Senate confirmation battle and helped investigate Democratic former President Bill Clinton in the 1990s.In picking the 53-year-old Kavanaugh, Trump aimed to entrench conservative control of the court for years to come with his second lifetime appointment to the nation's highest judicial body in his first 18 months as president.Kavanaugh now faces what appears to be another fierce fight for confirmation in the Senate, where Trump's fellow Republicans hold a slim majority. If confirmed, Kavanaugh would replace long-serving conservative Justice Anthony Kennedy, who announced his retirement on June 27 at age 81."Throughout legal circles he's considered a judge's judge, a true thought leader among his peers," Trump, who named conservative Justice Neil Gorsuch to the court last year, told an applauding audience in the White House East Room."He's a brilliant jurist with a clear and effective writing style, universally regarded as one of the finest and sharpest legal minds of our time. And just like Justice Gorsuch, he excelled as a legal clerk for Justice Kennedy," Trump added.The nominee has amassed a solidly conservative judicial record since 2006 on the influential US Court of Appeals for the District of Columbia Circuit, the same court where three current justices including Chief Justice John Roberts previously served. Some conservative activists have questioned whether he would rule sufficiently aggressively as a justice.Kavanaugh potentially could serve on the high court for decades. Trump's other leading candidates for the post were fellow federal appellate judges Thomas Hardiman, Raymond Kethledge and Amy Coney Barrett."A judge must be independent and must interpret the law, not make the law. A judge must interpret statutes as written and a judge must interpret the constitution as written," Kavanaugh said during the ceremony in which he underscored his ties to his family and his Roman Catholic faith.Kavanaugh served as a senior White House official under Republican former President George W. Bush before Bush picked nominated him to the appeals court in 2003. But some Democrats accused him of excessive partisanship and it took three years before the Senate eventually voted to confirm him.Kavanaugh worked for Kenneth Starr, the independent counsel whose investigation of Clinton helped spur an effort by congressional Republicans in 1998 and 1999 to impeach the Democratic president and remove him from office. Kavanaugh in 2009 changed his tune on the Starr probe, arguing that presidents should be free from civil lawsuits, criminal prosecutions and investigations while in office.Trump defeated Clinton's wife, Hillary Clinton, in the 2016 presidential election and has disparaged both Clintons.Democrats in the past also have pointed to Kavanaugh's work for Bush during the recount fight in the pivotal state of Florida in the 2000 presidential election, a controversy that was resolved only after the conservative-majority Supreme Court sided with Bush over Democratic candidate Al Gore, settling the election outcome.Kavanaugh once served as a Supreme Court clerk under Kennedy.The appointment will not change the ideological breakdown of a court that already has a 5-4 conservative majority, but nevertheless could move the court to the right. Kennedy sometimes joined the liberal justices on key rulings on divisive social issues like abortion and gay rights, a practice his replacement may not duplicate.Kennedy, 81, announced on June 27 plans to retire after three decades on the court, effective on July 31. Republicans hold a slim 51-49 majority in the Senate, though with ailing Senator John McCain battling cancer in his home state of Arizona they currently can muster only 50 votes. Without Republican defections, however, Senate rules leave Democrats with scant options to block confirmation of Trump's nominee.A group of Democratic senators from Republican-leaning states - lawmakers who could be pivotal in the confirmation fight - declined Trump's invitation to attend the White House announcement.Trump last year appointed Neil Gorsuch, who has already become one of the most conservative justices, after Senate Republicans in 2016 refused to consider Democratic former President Barack Obama's nominee Merrick Garland to fill a vacancy left by the death of conservative Justice Antonin Scalia. As a result, Democrats have accused Republicans of stealing a Supreme Court seat. Gorsuch restored the court's conservative majority.Democrats are certain to press Trump's latest nominee on the landmark 1973 Roe v. Wade ruling that legalized abortion nationwide, a decision some conservatives - particularly conservative Christians - have long wanted to overturn.Trump has previously said he wanted "pro-life" justices opposed to abortion rights. Top Senate Democrat Chuck Schumer earlier on Monday said Trump's nominee should be obligated to make his or her views clear on matters like the Roe ruling. Not long after Schumer spoke, Senate Majority Leader Mitch McConnell accused the "far left" of engaging in "scare tactics" over the nominee.The new justice can be expected to cast crucial votes on other matters of national importance including gay rights, gun control, the death penalty and voting rights. The court could also be called upon to render judgment on issues of personal significance to Trump and his administration including matters arising from Special Counsel Robert Mueller's ongoing Russia-related investigation and several civil lawsuits pending against Trump.The high court handed Trump and his administration a series of victories in its term that ended on the day of Kennedy's retirement, including a major decision upholding the president's travel ban targeting people from several Muslim-majority countries.Trump could yet have further opportunities to move to the court to the right. The court's senior liberal justice, Ruth Bader Ginsburg, is 85. Fellow liberal Stephen Breyer turns 80 next month.The timing of the nomination means that Kennedy's replacement could be confirmed before the start of the Supreme Court's next term on the first Monday in October.