North Korean leader Kim Jong Un arrived in China with his wife and other senior officials for a four-day trip. Kim, who reportedly traveled to China on his armored train, arrived during what is believed to be his 36th birthday. Business INsider reports North Korean propaganda outlets claimed Kim had been invited to the country by Chinese President Xi Jinping.The trip comes amid rumors of a second summit with US President Donald Trump, which may be held as early as this year.